Web_Quiz_4_Solutions

# Web_Quiz_4_Solutions - 1 You have two salts AgX and AgY...

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1. You have two salts, AgX and AgY, with very similar K sp values. You know that K a for HX is much greater than K a for HY. Which salt is more soluble in acidic solution? A. AgX B. AgY C. They are equally soluble in acidic solution. D. Cannot be determined by the information given. 2. A 1.0-liter buffered solution contains 0.70 M HNO 2 ( K a = 4.0 x 10 -4 ) and 0.80 M KNO 2 . What is the pH of this solution if 0.40 liters of 0.010 M NaOH are added? (3 sig figs)

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3. Calculate the [H + ] in a solution that is 0.10 M in NaF and 0.20 in HF. ( K a = 7.2 x 10 -4 ) A. 0.20 M B. 1.4 x 10 -3 M C. 7.0 x 10 -4 M D. 3.5 x 10 -4 M 4. Calculate the pH of a solution that is 0.2 M in acetic acid ( K a = 1.8 x 10 -5 ) and 0.2 M in sodium acetate. (2 sig figs)
5. You have solutions of 0.200 M HNO 2 and 0.200 M KNO 2 ( K a for HNO 2 = 4.00 x 10 -4 ). A buffer of pH 3.000 is needed. What volumes of HNO 2 and KNO 2 are required to make 1 liter of buffered solution? A. 500 mL of each B. 286 mL HNO 2 ; 714 mL KNO 2 C. 413 mL HNO 2 ; 587 mL KNO 2 D. 714 mL HNO 2 ; 286 mL KNO 2 E. 587 mL HNO 2 ; 413 mL KNO 2

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6. A 50.0-mL sample of 2.0 x 10 -4 M CuNO 3 is added to 50.0 mL of 4.0 M NaCN. Cu + reacts with CN - to form the complex ion Cu(CN) 3 2- : Cu(CN) 3 2- Cu + + 3CN - K = 1.0 x 10 -9 The concentration of Cu + at equilibrium is A. 2.0 x 10
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## This note was uploaded on 10/20/2009 for the course CHEM 105BLG taught by Professor Parr during the Spring '08 term at USC.

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Web_Quiz_4_Solutions - 1 You have two salts AgX and AgY...

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