Question

Exam review questions

2) In which aqueous system is PbF2 least soluble? 2) A) 1.0 M HNO3 B) H20 C) 0.5 M HF D) 0.2 MHF E) 0.8 M KF 3) A buffer solution contains 0.100 M fluoride ions and 0.126 M hydrogen fluoride. What is the 3) concentration (M) of hydrogen fluoride after addition of 7.00 mL. of 0.0100 M HCI to 25.0 mL of this C0.123 4) In which of the following aqueous solutions would you expect AgCl to have the lowest solubility?4 solution? A) 0.129 B)0963 D) 0.00976 E) 0.101 A) pure water B) 0.020 M LiC C) 0.010 M KCI D) 0.015 M NaC E) 0.0050 M AgNO3 5) Of the substances below,will decrease the solubility of Pb(No3)2 in a saturated solution. 5) C) Pb(CN)2 A) NaCN B) H202 D) Naci E) HCN 6) 6) A solution is prepared by dissolving 0.23 mol of lactic acid and 0.27 mol of sodium lactate in water sufficient to yield 1.00 L of solution.The addition of O the pHI to increase slightly. The pH does not increase drastically because the NaOH reacts with the present in the buffer solution. The Ka of lactic acid is 1.4 10-4 A) lactate B) lactic acid C) H30+ D) H20 E) This is a buffer solution: the pH does not change upon addition of acid or base.

Answer 1