None of the other halides behave like Cl - in this reaction. Identify the most reasonable alkaline metal chloride. The chloride of an unknown metal is believed to have the formula $\mathrm{MC a. KBr - Potassium bromide b. NiBr - Nickel bromide c. LiBr - Lithium bromide d. NaBr - Sodium bromide Transcribed Image Text: An unknown metal cation has a +1 charge. Homework Equations current*time=coulombs coulombs/96486=faraday What is the identity of the metal M? We obtained this identity through reacting the unknown chloride-containing solute with silver nitrate in acidic conditions to form a silver chloride precipitate. This only means that the X has a charge of +2 since there are 2 Cl in the compounds. Identify the most reasonable alkaline metal chloride compounds for the identity. Burn the loop end of the wire to remove any dust. The flame test is a qualitative test used in chemistry to help determine the identity or possible identity of a metal or metalloid ion found in an ionic compound. What is the identity of the alkaline earth metal chloride? 23. Many halide compounds of alkali and alkali earth metals are soluble in water. 1. 2) Write an expression for the given mass percent of oxygen: lithium chloride. What is the identity of m? Copper (II) chloride, also known as cupric chloride, is a inorganic salt used as catalysts in chemical synthesis and is also used in the manufacturing of pyrotechniques for its blue/green colors. So we have a molar quantity, and a given mass, and the "molecular mass . analyzed to determine the identity of the metal. Unknown salt could be any of the four: NiCl2 or NaCl or KCl or BaCl2.2H2O Write the molecular equation of the reaction. 4. A metal (M) forms a compound with the formula MCl3. 1 Three Students were asked to find the identity of the metal in a particular sulfate salt. Its chemical properties are intermediate between those for barium chloride, which is more toxic, and calcium chloride. Silver chloride precipitate can be further tested with ammonia solution for confirmation. I m. C 03 has a mass of It's a 2.395 gram sample, and, uh, we're told that chlorine is present in 1.28 grams, so metal em has a massive 1.115 grabs. This will give the mass of the metal. In a reaction between copper metal and an aqueous iron (III) chloride, Fe3+(aq) is reduced to Fe2+(aq), while Cu(s) is oxidized to Cu2+(aq). 3. softer (1) (b) Iron chloride has the formula FeCl 3 Relative atomic masses (Ar): Cl = 35.5; Fe = 56. A metal M forms a compound with the formula MCl 4.If the compound is 74.75% chlorine, what is the identity of M? Likewise, tin is going from a 2+ oxidation state in tin(II) chloride to being precipitated as tin metal. Identifying an unknown chloride salt by gravimetric analysis Summary Gravimetric analysis will be performed to identify an unknown chloride salt. I m. C 03 has a mass of It's a 2.395 gram sample, and, uh, we're told that chlorine is present in 1.28 grams, so metal em has a massive 1.115 grabs. The student then mixes the solution with excess AgNO3 solution, causing AgCl to precipitate. Ca2+ (aq) + Cl- (aq) / Na2C2O4. Note the test solutions are the same concentration (0.10 M) as that in the reacting system under analysis. By comparing the color given off by an unknown with the known metal salts, the identity of the metal salt can be determined. Write the full equation for the double replacement reaction that occurs between the calcium chloride and the metal carbonate in solution. Answer (1 of 2): Equivalent weight = weight of the metal/ weight of chlorine 35.5 = 29/71 35.5 = 14.5 Valency =2vapourdensity/( E+35.5 ) = 2 Equivalent weight valency = Atomic weight =14.52 =29 Therefore atomic weight = 29 Be as specific as possible! Given that the ionic compound contains either chloride or hydroxide, how can you determine which? The moles of calcium carbonate, CaCO3, are equal to the moles of Group 1 metal carbonate, M2CO3, added to the original solution. If the compound contains 65.57% Cl by mass, what is the identity of the metal? strontium chloride. "41.65 g"-"14.18 g"="27.47 g" The mass of the metal in the compound is . 2(IIA) Because The elements in Group 2 (IIA) are metals with a +2 oxidation state. In the molecule of your unknown compound you have three atoms of fluorine, this means that in one mole of this compound you have 57 g of fluorine (from 19.0 x 3) that represent 49.2% by weight. Write an ionic equation, including state symbols, for the reaction that takes place when sulfuric acid is added to solution Y . The X represents the alkaline alkaline earth metal that is in the unknown compound because it forms a compound with halogens, Chlorine, making the compound be XCl 2. . We have step-by-step solutions for your textbooks written by Bartleby experts! a. A 1.00-g sample of an alkaline earth metal chloride is treated with A 1.00-g sample of an alkaline earth metal chloride is treated with excess silver nitrate. So zinc acts as a reducing agent because it reduces tin(II) cations to tin metal. b) two molecules of oxygen are consumed per one mole of . 330 J. chemistry what is the identity of the alkaline earth metal? In . Specific questions: 1. Answer (1 of 5): It will be a double displacement reaction leading to the formation of sparingly soluble magnesium hydroxide as a white precipitate. What is the identity of m2co3? calcium chloride. A 4.000-g sample of the metal nitrate M(NO 3) 2 was dissolved in water and treated with excess aqueous sodium sulfate. electrolysis of an alkaline earth metal chloride using a current of 5.00 A for 748 seconds deposits 0.471 g of metal at the cathode. If appropriate they can be told that this gas is hydrogen. Copper and zinc atoms are different sizes. Solution added Observation with solution Y Sulfuric acid A white precipitate forms Magnesium nitrate A white precipitate forms (a) Suggest the identity of the group 2 metal ion present in solution Y. 5. Method 2: Take the nichrome or platinum wire and create a small loop at the end by bending the wire. The heat capacity of the calorimeter is 42.2 J/oC. Dip the loop into the lithium salt solution. 6 H 2 O.Chromium chlorides find use as catalysts and as precursors to dyes for wool. Size and chemical identity of Me-NPs are the main determinants of their toxicity. For instance sodium chloride has a mass percent of around 60% chloride. Solution #1: 1) Write an expression for the molar mass of the compound: Let M = the molar mass of the metal. What is the identity of the salt? Purpose: The purpose of this lab was to observe the characteristic colors produced by certain metallic ions when vaporized in a flame. The chloride of a metal (M) contains 65.5% of chlorine. 2. In addition, identical volumes (5 mL) are combined for . Conclusion : From this experiment, we determined the identity of a chloride-containing solute to be sodium chloride (NaCl). A 2.5624-g sample of a pure solid alkali metal chloride is dissolved in water and treated with excess silver nitrate. Also when give 3 reduction half reactions, and the molarities of the ions involved, how do you figure out how to separate them and whether or not it is feasible to separate different compounds in the same solution. The identity of the metal is: A cobalt B chromium C indium D gallium E bismuth Relative atomic masses: 1 faraday = 96,486 coulombs. The chloride content in my salt seemed much lower than other common possibilities. After teh precipitate had been filtered and dried, it weighed 0.2327 g. copper(II)chloride. A student dissolves the chloride of the unknown metal, MCl, in water to make it 100.0 mL of solution. The student collects the precipitate by filtration, dries it, and records the data shown below. Given the stoichiometry of the precipitation reaction, there were (2.51xx10^-2*mol)/2 = 1.26xx10^-2*mol MCl_2. Chemical Equations & Stoichiometry. Na+ (aq) + C2O42- (aq) / Ca2+ + C2O42-. Describe the evidence (observations) supporting the formation of solid copper metal in this reaction. Observe and record the "signs" of a chemical reaction when aluminum metal is added to a solution of copper(II) chloride. This has been known for a long time and . (Two pieces of evidence are required and one must be related to solubility rules) 3. If the compound is placed in the flame of a gas burner, there may be a characteristic color given off that is visible to the naked eye. Halides ions are fluorides chloride, bromide, and iodide. To find the percentage of the metal, first determine the difference between the mass of the compound and the mass of chlorine. softer (1) (b) Iron chloride has the formula FeCl 3 Relative atomic masses (Ar): Cl = 35.5; Fe = 56. Some halide compounds have colours which is useful to identify them. 2. This will contain the same number of moles of Ag+ and because the precipitate is AgCl, it will also be the same as the number of moles of Cl- (from the metal chloride). 1. Chlorine gas has characteristic odour, colour and bleaching properties. Name the precipitate. 2. (The molar mass of AgCl is 143 g/mol) Thus one atom of a Group 2 metal can combine with 2 atoms of chlorine (oxidation state = -1) Solutions for Chapter 18 Problem 13P: Electrolysis of an alkaline earth metal chloride using a current of 5.00 A for 748 seconds deposits 0.471 g of metal at the cathode. An unknown metal hydroxide (X(OH)2) is titrated with 100.0 mL of 2.00 M sulfuric acid to precipitate 46.7 g of the metal sulfate (XSO4). a) two moles of water are formed per one mole of methane consumed. What is the identity of the metal? Example #8: A certain metal hydroxide, M(OH) 2, contains 32.80% oxygen by mass. Methane reacts with oxygen to form carbon dioxide and water. Textbook solution for Chemistry 9th Edition Steven S. Zumdahl Chapter 18 Problem 98E. 100 ml of the vapour of the chloride of the metal at STP weights 0.72 g. The molecular formula of the metal chloride is: A metal M forms a volatile chloride containing 65.5% chlorine. The bromide of the unknown metal (Metal Br) is dissolved in enough water to make 100mL of solution. School Schoolcraft College; Course Title CHEM 104; Uploaded By MateEnergyCaribou19. . M + (2 x 16.00) + (2 x 1.01) M + 34.02. A gas is evolved at the negative electrode if the metal is high in the reactivity series. Halide compounds of Pb and Ag have colours. Specific questions: 1. Calcium chloride also has a chloride content of around 63%. All of the chloride is recovered as 1.38 g of silver chloride. They dissolved a 0.1472-g sample of the salt in water adn treated it with excess barium chloride, resulting in the precipitation of barium sulfate. The temperature of the water decreased by 0.93 oC. barium chloride. Given that the cation is from Group 1A, what is the identity of the group 1A metal ion in your solution? An unknown metal hydroxide (X(OH)2) is titrated with 100.0 mL of 2.00 M sulfuric acid to precipitate 46.7 g of the metal sulfate (XSO4). Since MCl2 is described as a salt, M is most likely to be a bivalent metal. CH 4 (g) + 2 O 2 (g) CO 2 (g) + 2 H 2 O (g) All of the following statements concerning this reaction are correct EXCEPT. Advertisement. Get solutions Get solutions Get solutions done loading Looking for the textbook? The student then mixes the solution with excess AgNO3 solution, causing the AgCl to precipitate. sodium chloride. Turn the collar on the Bunsen burner so that you have an invisible or pale blue flame. Like all compounds of Sr, this salt emits a bright red colour in a flame; in fact it is used as a source of redness in fireworks. Work out moles AgNO3 using volume in L x molarity. Na+ + Cl-. Answer (1 of 5): It will be a double displacement reaction leading to the formation of sparingly soluble magnesium hydroxide as a white precipitate. Now that you have identified the unknown metal in the metal carbonate, write the equation for the metal carbonate dissolving in water. Conduct tests of the reacting system to determine the identity of the ions forming the precipitate. Include states (s, l, g, aq). Determine the formula of the metal chloride and the accurate atomic weight of . X(OH)2 + H2SO4 2H2O + XSO4 Identify the metal. What is the identity of metal chloride? Given that the ionic compound contains either chloride or hydroxide, how can you determine which? The density of the water (and the solution) is 1.00 g/mL. This method of analysis allows for a quantitative determination of the mass percent of chlorine in the unknown through precipitation of the chloride ions in the form of silver chloride. Formula and structure: Copper (II) chloride chemical formula is CuCl 2 and the molar mass is 134.45 g mol -1. The sulfate salt that formed weighed 3.318 g. Determine the identity of the metal. Consider the dissolution of 1.50 grams of salt XY in 75.0 mL of water within a calorimeter. The percentage of the metal in the chlorine-containing compound is "65.95%". What is the identity of the metal chloride? answered expert verified M+ is an unknown metal cation with a +1 charge. If Cl=35.5, find the mass of this number of moles of Cl- ions and subtract this to find the mass of M in 20.0g of MCl. The specific heat of a metal was found to be 0.38 J/g*C. By determining the mass of the silver chloride, we were able . A) Pb B) Ba C) Ca D) K E) none of these 24. sodium chloride/potassium . Two moles of chlorine and let's find the mass of chlorine on it would be 35.5 grams per mole, three of 3.66 x 20 minutes Times 25 which means you have 1.28 grams of chlorine. These halide ion compounds exist in different forms in nature as solutions, precipitates and solids. Flame Test Lab. A known amount of the soluble unknown carbonate is dissolved in water to dissociate the compound into ions (Equation 1). Dividing the mass of the unknown carbonate by the moles of calcium carbonate yields the formula weight, and thus the identity, of the Group 1 metal carbonate. The specific heat capacity of the solution is 4.184 J/goC. The student collects the precipitate by filtration, dries it, and records the data shown below. How could the identity of the product be verified? Copper and zinc atoms are different sizes. Strontium chloride (SrCl2) is a salt of strontium and chloride. X +2 + Cl - --> XCl 2 3. Answer $\mathrm{M}=55.84 \mathrm{g} / \mathrm{mol}$ . Chromyl chloride (CrO 2 Cl 2) test is a unique test to identify Chloride ions. However, it does react with a solution of ferric chloride and also copper chloride. In other words, the tin(II) cations act as an oxidizing agent because they . Non-metals are formed at the positive electrode: chloride ions produce gaseous chlorine bromide and iodide ions form bromine and iodine respectively which dissolve to form coloured solutions. Light the Bunsen burner. This effect was even more . (i) Calculate the relative formula mass ( Mr) of iron chloride (FeCl3). One mole of unknown compound weighs (57/0.492) = 115.85 g. Knowing that 57 g are made by fluorine, the unknown atom will count for 58.85 g in each mole. Given that the cation is from Group 1A, what is the identity of the group 1A metal ion in your solution? After identifying the chloride salt in the sample, calculate the amount (mL) of .2M solution of silver nitrate assuming it is 100% pure. And to learn why light is shown as the color it is by the excitement of electrons jumping from one shell to the next. The resulting precipitate, filtered and dried, weighs 3.03707 g. What was the percent by mass of chloride ion in the original compound? Solutions (1.0 mol/L) of the following metal salts . (i) Calculate the relative formula mass ( Mr) of iron chloride (FeCl3). Include states. Divide the mass of the metal by the total mass of the compound and multiply by 100. Two moles of chlorine and let's find the mass of chlorine on it would be 35.5 grams per mole, three of 3.66 x 20 minutes Times 25 which means you have 1.28 grams of chlorine. potassium chloride. X(OH)2 + H2SO4 2H2O + XSO4 "Molar mass of metal chloride" = 126.2*g*mol^-1 We need a stoichiometric equation: MCl_2(aq) + 2AgNO_3(aq) rarr M(NO_3)_2(aq) + 2AgCl(s)darr "Moles of silver chloride:" = (3.60*g)/(143.32*g*mol^-1)=2.51xx10^-2*mol. Safety: Always use good safety techniques. Percentage of chlorine by mass = 63.89 So, percentage of M by mass in MCl2 = 100 - 63.89 = 36.11 Atomic ratio of M and chlorine (Cl) in one formula unit of MCl2 = 1 : 2 Atomic weight of chlorine = 35.46 Let the atomic weight of M be 'A'. Still another metal-specific effect of subchronic Me-NP intoxications considered in Section 3.1 is an increased reticulocyte percentage under the impact of PbO-NPs (24.7 2.7 against 10.2 1.4 in control rats, P < 0.05). The student then mixes the solution with excess AgNO3 solution, causing AgCl to precipitate. MgCl2 (aq) + 2NaOH (aq) Mg(OH)2 (s) + 2NaCl (aq) The other product, sodium chloride, remains in solution. Reacting 47.4 mL of 0.320 M AgNO 3 with 48.0 mL of 0.300 M K 2 CrO 4 results in what mass of . A solution of a trivalent metal ion is electrolysed by a current of 5.0A for 10 minutes during which time 1.18g of metal was plated out. M+ is an unknown metal cation with a +1 charge. When 0.5007 g of this metal was heated in a stream of chlorine gas, it produced 1.0586 g of a metal chloride, MClx. Pages 4 Ratings 33% (3) 1 out of 3 people found this document helpful; (Two pieces. MgCl2 (aq) + 2NaOH (aq) Mg(OH)2 (s) + 2NaCl (aq) The other product, sodium chloride, remains in solution. A student dissolves the chloride of the unknown metal, MCl, in enough water to make 100.0 mL of solution. What is the identity of the metal? Magnesium chloride has an even higher mass percent of chloride in it at 74%. harder This makes brass more flexible than the pure metals. As well as to identify unknown metallic ions by means of its flame test. harder This makes brass more flexible than the pure metals. of evidence are required and one must be related to solubility rules) 3. A student dissolves the chloride of the unknown metal, MCl, in enough water to make 100.0 mL of solution. Does copper and iron chloride react? A metal M forms a compound with the formula MCl 4.If the compound is 74.75% chlorine, what is the identity of M? This means that it's gaining electrons, which must mean that it's being reduced. Wear . Potassium chloride has around 47% chloride in it. M 2CO 3(s) 2M+(aq) + CO 3 2-(aq) Equation 1 When a solution of calcium chloride, CaCl 2, is added to this metal carbonate solution, a Cl has a charge of -1. Copper is one of the least reactive metals.