230_F09_E3_blank - Clearly circle the one correct answer...

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Clearly circle the one correct answer for each question #1-8. 1) Which of the following mixtures gives a buffer with a pH greater than 7.0? For HCNO, K a = 2.2x 10 –4 and for NH 3 , K b = 1.8x10 –5 . A) 10 mL of 0.1 M NH 3(aq) + 10 mL of 0.1 M HCl (aq) B) 10 mL of 0.1 M HCNO (aq) + 10 mL of 0.1 M NaCNO (aq) C) 10 mL of 0.1 M HCNO (aq) + 5.0 mL of 0.1 M NaOH (aq) D) 10 mL of 0.1 M NH 3(aq) + 10 ml of 0.1 M HCNO (aq) E) 10 mL of 0.1 M NH 3(aq) + 5.0 mL of 0.1 M HCl (aq) 2) Consider the titration of 15.0 mL of 0.200 M H 3 PO 4(aq) with 0.200 M NaOH (aq) . What is/are the major species in solution after the addition of 30.0 mL of base? A) H 3 PO 4(aq) and H 2 PO 4 (aq) B) H 2 PO 4 (aq) C) H 2 PO 4 (aq) and HPO 4 2– (aq) D) HPO 4 2– (aq) E) PO 4 3– (aq) 3) How many grams of copper will be plated out of a CuBr solution if a current of 1.5 A is applied for 2.5 hours.? A) 0.003 g B) 8.9 g C) 13.9 g D) 17.8 g 4) Which one of the following combinations of reagents will result in a spontaneous reaction? A) Al (s) + CuCl 2(aq) B) Al (s) + CaCl 2(aq) C) Zn (s) + CaCl 2(aq) D) Cu (s) + ZnCl 2(aq) 5) Which of the following is TRUE? A) In stepwise reactions, the rate-determining step must ALWAYS be the slow one. B)
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230_F09_E3_blank - Clearly circle the one correct answer...

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