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Chapter 15 Solutions
Chemistry: An Atoms First Approach
- A 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_forwardAn aqueous solution contains 0.28 M hydrofluoric acid. One Liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as each substance is added.) O 0.139 mol NaOH 0.28 mol NaNO, 0.14 mol HNO, 0.29 mol HNO3 O 0.29 mol NaFarrow_forwardA chemistry graduate student is given 100. mL of a 0.90M hydrocyanic acid (HCN) solution. Hydrocyanic acid is a weak acid with K,=4.9 × 10 10 What mass of KCN should the student dissolve in the HCN solution to turn it into a buffer with pH = 8.97? You may assume that the volume of the solution doesn't change when the KCN is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.arrow_forward
- A solution is formed by adding 3.20 grams of solid sodium hypochlorite, NaClO, to 500.0 ml of 0.0750M calcium hypochlorite, Ca(ClO)₂. Calculate the pH of the resulting solution. You may assume that the sodium hypochlorite dissolve completely and that the change in volume is negligible with the addition of the solid.arrow_forwardThe solubility product for silver (I) bromide is 7.7 × 10–13. Calculate the molar solubility of silver (I) bromide.arrow_forwardAn aqueous solution contains 0.34 M potassium hypochlorite.One liter of this solution could be converted into a buffer by the addition of:(Assume that the volume remains constant as each substance is added.) More than one can be selected. 0.34 mol HNO3 0.33 mol KCl 0.17 mol NaOH 0.33 mol HClO 0.17 mol HNO3arrow_forward
- Determine the concentration (mol/L) of hydroxide that must be added to an aqueous solution to produce a concentration of 0.35 mg/L copper if the starting concentration is 2.5 mg/L copper. The solubility product for copper hydroxide (Cu(OH)2) is 2.2 x 1020 mol/L. What is the resulting solution pH?arrow_forward7. A 10.00-g sample of the ionic compound NaA, where A is the anion of a weak acid, was dissolved in enough water to make 100.0 mL of solution and was then titrated with 0.100 M HCl. After 500.0 mL HCl was added, the pH was 5.00. The experimenter found that 1.00 L of 0.100 M HCl was required to reach the stoichiometric point of the titration. a. What is the molar mass of NaA? b. Calculate the pH of the solution at the stoichiometric point of titration.arrow_forwardIn the lab, you have access to the following solutions: 0.500 M ammonia, 0.500 M acetic acid, 2.00 M nitric acid, and 2.00 M sodium hydroxide. How would you prepare 500.0 mL of a buffer of pH = 5.00? Assume volumes are additive.arrow_forward
- 1. A 0.270 M solution of sodium formate, used in several fabric dyeing and printing processes, is prepared by dissolving it in water. A 75.0-mL sample of this sodium solution is titrated with a 10 mL of 0.270 M hydroboric acid (HBr, strong acid) at 25°C. What is the pH of the solution after adding the 10 mL of HBr? Sodium formate is a basic salt, with the formula NaCOOH. (Note...sodium formate's conjugate is HCOOH, with a Ka of 1.7 x10 at 25°C).arrow_forwardRichard and Jessica are lab partners. They pour 40.0 mL of a 0.200 M HC2H3O2 solution into a 250 mL flask. They then set up a burette and add 0.250 M NaOH solution to the burette. They are asked to fill in the table below. The first box asks for the pH of the acetic acid without any NaOH added. The second through tenth boxes show the pH after the indicated amounts of NaOH are added to the acetic acid solution. Please show your work for the first, sixth and tenth boxes. The initial reaction is: H₂O (L) + HC2H3O2 (aq) = H₂O* (aq) + C₂H₂O₂ with Ka = 1.8 x 105 and the reaction involving NaOH is: NaOH (aq) + HC₂H₂O₂ (aq) = H₂O (L) + C₂H₂O₂ (aq). mL of NaOH added pH Box 1 work 0.00 2.72 4.00 8.00 3.46 3.99 12.00 16.00 4.37 H3O+ HCz HyOz | Hz H3 C2H3O2 20.00 24.00 28.00 32.00 36.00 Initial .200 0 PH= 2.72 change -X X X Equilibrium 200-x 1.8×10-5 = x² X X = 3.6 × 10-6 = √x²= √3.6×10-6 1 .200 Box 6 work Box 10 work [H 301 = 0.00189 pH = 100 [H3O+] =arrow_forward4. The concentration of a NaOH solution is determine by using the solution to titrate a sample of potassium hydrogen phthalate (C8H5O4K, M = 204.22 g/mol). In the titration 34.67 mL of NaOH solution is required to react with 0.1082 g C8H5O4K to reach the equivalence point. a) Calculate the concentration of the sodium hydroxide solution. Potassium hydrogen Phthalate = 0-10829, Molar mass of KMP=204-22 Hales of KMP = Mass 0.10829 g/mol Mm 6.000529 mal 204229/Mal Concentration of NaOH = Males = = of volume of Naot (L) = 0-000529 mal 34-67 mе onl ها NaOH (mal) = 0.000015258 mal/L 0.015M b) This solution of sodium hydroxide is used for another titration. A sample of 10.0 mL of HCI is neutralized using 22.1 mL of sodium hydroxide solution. Calculate the concentration of the HCI solution. sodium hydroxide 222.1 ml, Nal100arrow_forward
- Chemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage LearningChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage Learning
- Chemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning