UMass Amherst CHEM 112 - Chem 112 Exam 3 Review (3 pages)

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Chem 112 Exam 3 Review



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Chem 112 Exam 3 Review

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Pages:
3
School:
University of Massachusetts Amherst
Course:
Chem 112 - Gen Chem-Sci

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Exam 3 Review Which of the following chemical equations corresponds to K b1 for SO 3 2 A SO 3 2 aq H 2 O B H 2 SO 3 aq OH aq HSO 3 aq OH aq HSO 3 aq H 2 O C HSO 3 aq H 2 O H 2 SO 3 aq OH aq D SO 3 2 aq H3O aq HSO3 aq H2O L E HSO 3 aq OH aq SO 3 2 aq H 2 O Which of the following species is the strongest acid in an aqueous solution A CH 3 CO 2 H B CH 3 CH 2 CO 2 H C CH 2 ClCO 2 H D CHCl 2 CO 2 H E CCl 3 CO 2 H What is the pH of the solution which results from mixing 33 8 mL of 0 512 M HF aq and 33 8 mL of 0 512 M NaOH aq at 25 C K a of HF 7 2E 4 A 8 17 B 8 28 C 8 37 D 5 72 E 10 6 All of the following compounds are acids containing chlorine Which compound is the weakest acid A HClO2 B HCl C HClO D HClO3 E HClO4 If the ratio of base to acid in a buffer is decreased by a factor of 10 the buffer pH decreases by Which one of the following conditions is always true for a titration of a weak acid with a strong base A If a colored indicator is used it must change color rapidly in the weak acid s buffer region B A colored indicator with a pKa less than 7 should be used C The equivalence point occurs at a pH greater than 7 D The equivalence point occurs at a pH equal to 7 E Equal volumes of weak acid and strong base are required to reach the equivalence point Which of the following equations is the solubility product for Cu II hydroxide Cu OH 2 Exam 3 Review What mass of KCl molar mass 74 55 g mol must be added to 1 03 L of 1 92E 2 M Pb 2 aq to initiate precipitation of PbCl 2 s The K sp of PbCl 2 is 1 7E 5 Assume no volume change occurs upon addition of KCl A 1 11 g B 2 28 g C 2 22 g D 4 11E 4 g E 1 14 g The K a of bicarbonate ion HCO 3 is 4 8E 11 What base acid ratio is necessary to make a buffer with a pH of 10 7 A 1 46 B 2 41 C 0 381 D 24 1 E 0 416 Which of the following combinations would be best to buffer an aqueous solution at a pH of 7 0 A HNO 2 and NO 2 K a 4 5E 4 B CH3CO2H and CH3COO Ka 1 8E 5 C H 2 PO 4 and HPO 4 2



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