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Chapter 15 Solutions
EBK 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_forwardFor the titration of an aqueous nitrous acid solution, HNO,(aq), with an aqueous strontium hydroxide solution, Sr(OH)2{aq), what do you expect the pH of the solution to be at the equivalence point? O Basic (pH > 7.00) O Unable to determine the pH of the solution at the equivalence point without additional information O Acidic (pH < 7.00) O Neutral (pH = 7.00)arrow_forwardWhen some sodium hydroxide is gradually added to a solution of lead nitrate Pb(NO3)2 at 0.01 mol.L-¹, lead hydroxide Pb(OH)2 starts to precipitate at pH of 7.5; Calculate the solubility product of Pb(OH)2. What is the solubility of lead hydroxide in water? What would be the concentration of Pb²+ if the pH of the initial solution was fixed to 9? The answer : 1) Ks 10-¹5 ;2) 6.3×10-6 mol.L-¹; 3) [Pb²+] = 10–5 mol.L-¹arrow_forward
- An 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_forwardYou are trying to determine the percentage of acetic acid in vinegar by titrating a sample of the vinegar with a standardized NaOH solution. Why is bromcresol green not a good choice for an indicator for this titration? If you do use bromcresol green as an indicator, will your result for the percentage of acetic acid in vinegar be too high or too low? What would be a better choice for an indicator for this titration? Why is your choice better?arrow_forward
- A 10.0 mL sample of 0.20 mol/L NiF2(aq) is mixed with 20.0 mL of 0.0700 mol/L NaOH(aq) and then diluted to a final volume of 100. mL. Calculate the concentration of OH- ions in the 100 mL mixture before the reaction starts. Express your answer to three significant figures.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_forwardSuppose you have 50.0 mL of a solution of an unknown concentration of hydrochloric acid HCl solution. You titrate the HCl solution with a 0.1 M solution of calcium hydroxide Ca(OH)2 and use 13.5 mL of Ca(OH)2 to reach the endpoint. 4a) What is the molarity of the hydrochloric acid HCl solution? 4b) What is the pH of hydrochloric acid HCl solution?arrow_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_forwardThe acidity of a solution is measured by its pH. If HT| represents the concentration of hydrogen ions (in moles/liter) in the solution, the pH is defined by pH = – log H+ Based on careful measurements and calculations, a chemist examines two solutions and asserts: "The hydrogen ion concentration of Solution A is 37.93% greater than the hydrogen ion concentration of Solution B." If the pH of solution B is 4.36, determine the pH of Solution A. Report your answer to two decimal places. Solution A has pH equal to Number - (Report to the nearest 0.01)arrow_forwardA chemistry graduate student is given 125. mL of a 0.80M ammonia (NH3) solution. Ammonia is a weak base with K₂ = 1.8 × 10. What mass of NHÂBr should the student dissolve in the NH3 solution to turn it into a buffer with pH = 9.55? 4 You may assume that the volume of the solution doesn't change when the NH Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. 0 x10 × Sarrow_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