Chemistry: The Molecular Nature of Matter
7th Edition
ISBN: 9781118516461
Author: Neil D. Jespersen, Alison Hyslop
Publisher: WILEY
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Chapter 17, Problem 20RQ
Selective Precipitation
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How will you compare the precipitates of the solution containing Ag+ and Pb+2 ions?
You have been given an unknown that contains a Group I ion (Ag+ or Hg22+), a Group II ion (Fe2+ or Mn2+) and a Group III ion (Cu2+ or Ni2+).
First you place 5 drops in a test tube and add 3 drops of 3 M HCl. You see a white precipitate.
Next you add 1mL of 6 M NH3. The precipitate turns a little gray, but you are unsure if it is gray or white. You run some tests to confirm and believe it is gray.
1. What test did you run to confirm the precipitate is gray and what is the identity of the Group I ion (use complete sentences and type your answer in the space below)?
Next, you place 5 mL of fresh unknown in a test tube and add 5 mL of HCl (and again see a white precipitate.
2. How do you separate the white precipitate, so that you can test the ions in the solution that aren’t precipitated (use complete sentences and type your answer in the space below)?
Now you have separated the solution from the precipitate. You discard the precipitate and need to test…
The lead in a 0.2000-g sample is precipitated as PbCrO4. The precipitate is filtered, washed, and dissolved in acid giving a solution containing dichromate ions and lead ions. The dichromate requires 15.50 ml of 0.1 M ferrous sulfate for titration. Calculate the percentage of lead in the sample.
Chapter 17 Solutions
Chemistry: The Molecular Nature of Matter
Ch. 17 - What are the ion product expressions for the...Ch. 17 - What are the ion product expressions for the...Ch. 17 - The solubility of thallium(I) iodide, TlI, in...Ch. 17 - One liter of water will dissolve mol of ....Ch. 17 - Prob. 5PECh. 17 - Calculate the molar solubility of
Ch. 17 - Calculate the molar solubility of AgI in a...Ch. 17 - Prob. 8PECh. 17 - Calculate the ion product for the solution in...Ch. 17 - Calculate the ion product for a solution...
Ch. 17 - What precipitate might be expected if we mix ?...Ch. 17 - 50.0 mL of 0.10 M Pb(NO3)2 and 20.0 mL of 0.040 M...Ch. 17 - Determine whether adding an acid will increase the...Ch. 17 - Determine the molar solubility of Ag2CrO4in1.0MH+...Ch. 17 - What pH is needed to achieve a concentration of...Ch. 17 - What pH is needed to dissolve 2.00 g PbS in...Ch. 17 - If a solution contains calcium ions (0.25 M) and...Ch. 17 - Prob. 18PECh. 17 - Suppose a solution contains and is saturated with ...Ch. 17 - Consider a solution containing , both at...Ch. 17 - The Ksp for barium oxalate,...Ch. 17 - A solution contains calcium nitrate and nickel...Ch. 17 - Calculate the solubility of silver chloride in ...Ch. 17 - How many moles of have to be added to 1.0 L of...Ch. 17 - Equilibria in Solutions of Slightly Soluble Salts...Ch. 17 - Equilibria in Solutions of Slightly Soluble Salts...Ch. 17 - Equilibria in Solutions of Slightly Soluble Salts...Ch. 17 - Equilibria in Solutions of Slightly Soluble...Ch. 17 - Prob. 5RQCh. 17 - Prob. 6RQCh. 17 - Equilibria in Solutions of Slightly Soluble Salts...Ch. 17 - Solubility of Basic Salts Is Influenced by...Ch. 17 - Prob. 9RQCh. 17 - Solubility of Basic Salts Is Influenced by...Ch. 17 - Solubility of Basic Salts Is Influenced by Acids...Ch. 17 - Solubility of Basic Salts Is Influenced by Acids A...Ch. 17 - Solubility of Basic Salts Is Influenced by Acids...Ch. 17 - Solubility of Basic Salts Is Influenced by Acids...Ch. 17 - Equilibria in Solutions of Metal Oxides and...Ch. 17 - Equilibria in Solutions of Metal Oxides and...Ch. 17 - Equilibria in Solutions of Metal Oxides and...Ch. 17 - Selective Precipitation Use Le Chatelier's...Ch. 17 - Prob. 19RQCh. 17 - Selective Precipitation If you had a solution with...Ch. 17 - Equilibria Involving Complex Ions Explain the...Ch. 17 - Equilibria Involving Complex Ions What is a...Ch. 17 - Complexation and Solubility
17.23 Using Le...Ch. 17 - Complexation and Solubility For...Ch. 17 - Prob. 25RQCh. 17 - Equilibria in Solutions of Slightly Soluble...Ch. 17 - Prob. 27RQCh. 17 - Prob. 28RQCh. 17 - Prob. 29RQCh. 17 - Prob. 30RQCh. 17 - Prob. 31RQCh. 17 - Which compound is more soluble in water,...Ch. 17 - 17.33 In water, the solubility of lead(II)...Ch. 17 - The solubility of zinc oxalate is 7.9103M....Ch. 17 - 17.35 Barium sulfate is so insoluble that it can...Ch. 17 - A student found that a maximum of 0.800 g silver...Ch. 17 - Prob. 37RQCh. 17 - A student prepared a saturated solution of CaCrO4...Ch. 17 - At 25C, the molar solubility of silver phosphate...Ch. 17 - 17.40 The molar solubility of barium phosphate in...Ch. 17 - What is the molar solubility of PbBr2 in water?Ch. 17 - 17.42 What is the molar solubility of in water?
Ch. 17 - Calculate the molar solubility of Zn(CN)2 in...Ch. 17 - Calculate the molar solubility of PbF2 in water....Ch. 17 - 17.45 At , the value of for , and that for ....Ch. 17 - At 25C, the value of Ksp for AgCNis6.010-17 and...Ch. 17 - A salt whose formula is MX has a Ksp equal to...Ch. 17 - 17.48 A salt having a formula of the type has ....Ch. 17 - Calcium sulfate is found in plaster. At 25C the...Ch. 17 - Chalk is CaCO3, and at 25CitsKsp=3.410 What is the...Ch. 17 - It was found that the molar solubility of BaSO3 in...Ch. 17 - 17.52 The molar solubility of . What is the value...Ch. 17 - Prob. 53RQCh. 17 - Mercury(I) chloride has Ksp=1.41018. Calculate the...Ch. 17 - Calculate the molar solubility of Mg(OH)2 in a...Ch. 17 - 17.56 Calculate the molar solubility of in a...Ch. 17 - 17.57 What is the highest concentration of that...Ch. 17 - 17.58 Will lead (II) bromide be less soluble in...Ch. 17 - Calculate the molar solubility of...Ch. 17 - 17.60 What is the molar solubility of in (a) 0.20...Ch. 17 - 17.61 What is the molar solubility of in a buffer...Ch. 17 - What is the molar solubility of Ca(OH)2 in (a)...Ch. 17 - In an experiment, 2.20gofNaOH(s) is added to 250...Ch. 17 - Suppose that 1.75 g of NaOH(s) is added to 250 mL...Ch. 17 - 17.65 Docs a precipitate of form when are...Ch. 17 - Prob. 66RQCh. 17 - 17.67 Docs a precipitate of form if 50.0 ml. of ...Ch. 17 - Prob. 68RQCh. 17 - 17.69 Suppose that 50.0 mL each of 0.0100 M...Ch. 17 - If a solution of 0.10 M Mn2+ and 0.10 M Cd2+ is...Ch. 17 - In an aqueous suspension of Ca(OH)2, the only...Ch. 17 - Suppose that 25.0 mL of 0.10MHCl is added to 1.000...Ch. 17 - *17.73 When solid is added to a suspension of ...Ch. 17 - *17.74 After solid was added to a slightly basic...Ch. 17 - *17.75 Will a precipitate form in a solution made...Ch. 17 - 17.76 What is the molar solubility of in water?...Ch. 17 - Solubility of Basic Salts Is Influenced by...Ch. 17 - Solubility of Basic Salts Is Influenced by...Ch. 17 - *17.79 What is the molar solubility of in pure...Ch. 17 - 17.80 What is the molar solubility of in pure...Ch. 17 - How many grams of solid sodium acetate must be...Ch. 17 - How many grams of solid potassium fluoride must be...Ch. 17 - What is the molar solubility of Mg(OH)2 in 0.1MNH3...Ch. 17 - *17.84 If 100 mL of is added to 0.400 L of a...Ch. 17 - Equilibria in Solutions of Metal Oxides and...Ch. 17 - Prob. 86RQCh. 17 - *17.87 Does nickel(II) sulfide dissolve in 4 M...Ch. 17 - Does iron(II) sulfide dissolve in 8 M HCl? Perform...Ch. 17 - Selective Precipitation Both AgCl and AgI are very...Ch. 17 - Prob. 90RQCh. 17 - 17.91 What value of and what pH permit the...Ch. 17 - What pH would yield the maximum separation of Mn2+...Ch. 17 - Prob. 93RQCh. 17 - Kidney stones often contain insoluble calcium...Ch. 17 - 17.95 Solid is added to a solution of . After...Ch. 17 - What value of [ H+ ] and what pH would allow the...Ch. 17 - Prob. 97RQCh. 17 - *17.98 In the metal plating industry, the waste is...Ch. 17 - Equilibria Involving Complex Ions
17.99 Write the...Ch. 17 - Equilibria Involving Complex Ions
17.100 Write the...Ch. 17 - Prob. 101RQCh. 17 - Prob. 102RQCh. 17 - Prob. 103RQCh. 17 - Prob. 104RQCh. 17 - For PbCl3, Kform=2.510 . Use this information plus...Ch. 17 - The overall formation constant for Ag(CN)2 equals...Ch. 17 - How many grams of solid NaCN have to be added to...Ch. 17 - Prob. 108RQCh. 17 - Silver iodide is very insoluble and can be...Ch. 17 - 17.110 Silver forms a sparingly soluble iodide...Ch. 17 - The formation constant for Ag(CN)2-equals5.341018....Ch. 17 - 17.112 Suppose that some dipositive cation, , is...Ch. 17 - (Calculate the molar solubility of...Ch. 17 - The molar solubility of Zn(OH)2in1.0MNH3 is...Ch. 17 - What ratio of Ksp values will allow for the use of...Ch. 17 - A student had a solution that contained...Ch. 17 - Suppose that 50.0 mL of 0.12 M AgNO3 is added to...Ch. 17 - Prob. 118RQCh. 17 - Prob. 119RQCh. 17 - In Example 17.11 we say, there are relatively few...Ch. 17 - *17.121 What is the molar solubility of ? What is...Ch. 17 - *17.122 An old method for mining gold was to wash...Ch. 17 - What is the molar concentration of Cu2+ ion in a...Ch. 17 - On the basis of the KspofAl(OH)3, what would be...Ch. 17 - The compound EDTA is used to remove soap scum, as...Ch. 17 - A chemist has a solution that contains a mixture...Ch. 17 - You are given a sample containing , both with...Ch. 17 - Prob. 128RQCh. 17 - In modern construction, walls and ceilings are...Ch. 17 - *17.130 How many milliliters of would have to be...Ch. 17 - Marble is composed primarily of CaCO3, a slightly...Ch. 17 - *17.132 The pH of a saturated solution of is 9.8....Ch. 17 - The osmotic pressure of a saturated solution of...Ch. 17 - A saturated solution of PbCl2 has a freezing point...Ch. 17 - 17.135 Consider mercury(II) sulfide, , which has a...Ch. 17 - If aqueous ammonia is added gradually to a...Ch. 17 - From a practical standpoint, can you effectively...Ch. 17 - 17.139 In older textbooks, the solubility...Ch. 17 - Suppose two silver wires, one coated with silver...
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- Each pair of ions below is found together in aqueous solution. Using the table of solubility product constants in Appendix J, devise a way to separate these ions by adding a reagent to precipitate one of the ions as an insoluble salt and leave the other in solution. (a) Cu2+ and Ag+ (b) A13+ and Fe3+arrow_forwardWhat is the Cl concentration just as Ag2CrO4 begins to precipitate when 0.90 M AgNO3 is slowly added to a solution containing 0.015 M Cl and 0.015 M CrO42?arrow_forwardDescribe how you could separate the ions in each of the following groups by selective precipitation. a. Ag+, Mg2+, Cu2+ b. Pb2+, Ca2+, Fe2+ c. Pb2+, Bi3+arrow_forward
- You are given four different aqueous solutions and told that they each contain NaOH, Na2CO3, NaHCO3, or a mixture of these solutes. You do some experiments and gather these data about the samples. Sample A: Phenolphthalein is colorless in the solution. Sample B: The sample was titrated with HCl until the pink color of phenolphthalein disappeared, then methyl orange was added. The solution became pink. Methyl orange changes color from pH 3.01 (red) to pH 4.4 (orange). Sample C: Equal volumes of the sample were titrated with standardized acid. Using phenolphthalein as an indicator required 15.26 mL of standardized acid to change the phenolphthalein color. The other sample required 17.90 mL for a color change using methyl orange as the indicator. Sample D: Two equal volumes of the sample were titrated with standardized HCl. Using phenolphthalein as the indicator, it took 15.00 mL of acid to reach the equivalence point; using methyl orange as the indicator required 30.00 mL HCl to achieve neutralization. Identify the solute in each of the solutions.arrow_forwardCalculate the mass of manganese hydroxide present in 1300 mL of a saturated manganese hydroxide solution. For Mn(OH)2, Ksp = 2.0 1013.arrow_forwardA solution contains Ca2+ and Pb2+ ions, both at a concentration of 0.010 M. You wish to separate the two ions from each other as completely as possible by precipitating one but not the other using aqueous Na2SO4 as the precipitating agent. (a) Which will precipitate first as sodium sulfate is added, CaSO4 or PbSO4? (b) What will be the concentration of the first ion that precipitates (Ca2+ or Pb2+) when the second, more soluble salt begins to precipitate?arrow_forward
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