AP Chem Ch 15 Practice Quiz-1

AP Chem Ch 15 Practice Quiz-1 - AP Chem Ch 15 Practice Quiz...

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AP Chem Ch 15 Practice Quiz 1. The common ion effect a) reduces the dissociation of a weak acid b) increases the dissociation of a weak acid c) changes the equilibrium constant for a reaction d) Has no effect on the dissociation of a weak acid 2. Which of the following combinations in solution CANNOT be a buffer? a) HNO 2 /KNO 2 b) KCl/HCl c) NH 3 /NH 4 NO 3 d) NaH 2 PO 4 /H 3 PO 4 e) NaF/HF 3. Which of the following combinations in solution CAN produce a buffer? a) KHSO 4 /H 2 SO 4 b) Na 2 CO 3 /NaOH c) HCl/NaF d) HCl/NH 4 Cl e) NaOH/NaCN 4. What change will be caused by addition of a small amount of a strong acid to a solution containing fluoride ion and hydrogen fluoride? a) The concentration of hydronium ion will significantly increase b) The concentration of fluoride ion will increase as will the concentration of hydronium ion c) The concentration of hydrogen fluoride will be decreased and the concentration of fluoride ion will be increased d) The concentration of fluoride ion will be decreased and the concentration of hydrogen fluoride will be increased e) The fluoride ion will precipitate out of the solution as its acid salt 5. What is the pH of a solution prepared by mixing 50 ml of a 0.10M solution of HF with 25 ml of a 0.20M solution of NaF? (The pKa of HF is 3.14) a) 3.14 b) 10.80 c) 5.83 d) 7.35 e) 12.00 6. What is the pH of a solution that is 0.2M in acetic acid (Ka = 1.8 x 10 -5 ) and 0.2M in sodium acetate? a) 4.7 b) 9.3 c) 7.0 d) 5.4 e) 8.6 7. For ammonia, Kb is 1.8 x 10 -5 . to make a buffered solution of pH 10.0, the ratio of NH 4 Cl to NH 3 must be: a) 1.8 : 1 b) 1 : 1.8 c) 0.18 : 1 d) 1 : 0.18 e) none of these
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8. A solution contains 0.500M HA (Ka = 1.0 x 10 -8 ) and 0.250M NaA. What is the [H + ] after 0.10 mole of HCl(g) is added to 1.00 L of this solution? a) 1.4 x 10 -8 M b) 2.0 x 10 -8 M c) 2.5 x 10 -9 M d) 4.0 x 10 -8 M e) none of these 9. Given 100.0 ml of a buffer that is 0.50 M in HOCl and 0.40 M in NaOCl, what is the pH after 10.0 ml of 1.0 M NaOH has been added? (Ka for HOCl =3.5 x 10
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This note was uploaded on 03/17/2010 for the course SCI 001 taught by Professor Durkka during the Spring '09 term at Acton School of Business.

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AP Chem Ch 15 Practice Quiz-1 - AP Chem Ch 15 Practice Quiz...

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