216AcidBasesamplekey - resulting solution will be basic,...

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a b c d 9. In a solution prepared by mixing equal volumes of acetic acid and hydrobromic acid the common ion is a) Br b) C 2 H 3 O 2 c) H 2 Br + d) H 3 O + a b c d 10. Which of the following is the strongest acid a) H 2 S b) NH 3 c) H 2 Se d) H 2 O a b c d 11. A solution has a pOH of -0.47. This means that: a) The soluton has a pH of 13.53 b) The solution has a [OH - ] = 2.95 M c) The solution has a [H 3 O + ] = 2.95 M d) The solution has a [OH - ] greater than 10 M 1. Arrange the following compounds in order of increasing acidity. NaOH < CH 3 CO 2 H < ClCH 2 CO 2 H< Cl 3 CCO 2 H<HCl<HI - most acidic 2. Determine the pH of 0.0120 molar benzoic acid, HC 7 H ^ O 2 . (K a = 6.3 x 10 –5 ) (8 points) HC 7 H ^ O 2 H 2 O H 3 O + C 7 H ^ O 2 I 0.0120 C –x +x +x E 0.0120 –x x x K a = [C 7 H 6 O 2 - ].[ H 3 O + ] [HC 7 H 6 O 2 ] = x . x (0.0120 - x ) = 6.3 x 10 –5 Assume x is small compared to 0.0120, so : x 2 (0.0120) = 6.3 x 10 –5 x = 8.7 x 10 -4 = [ H 3 O + ] pH = - log[ H 3 O + ] = - log[8.7 x 10 -4 ] pH = 3.06 3. Determine the pH of 0.5 M acetic acid, CH 3 CO 2 H solution. (K a = 7.4 x 10 –5 ) Solution same as above. Answer is: pH = 2.2
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4. State which of the following compounds will hydrolyze water and state whether the
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Unformatted text preview: resulting solution will be basic, acidic or neutral. a) NaNO 2 Salt of a weak acid and strong base, pH>7, basic b) MgCl 2 Salt of strong base and strong acid, pH = 7, neutral c) NH 4 Cl Salt of strong acid and weak base, pH<7, acidic d) NH 4 CH 3 CO 2 H Salt of weak acid and weak base, K a = K b , pH=7, neutral 5. Indicate whether solutions of the following compounds will be acidic, basic, or neutral. Briefly explain why in each case) (10 points) a) NaOCl Salt of a weak acid and strong base. pH>7, basic b) CsCl Salt of a strong acid and strong base. pH=7, neutral c) NH 4 F (K b for NH 3 is 1.8 x 10-5 , K a for HF is 6.6 x 10-4 ) Salt of a weak acid and weak base. since K a for acid is greater than K b , for base, the K b for the conjugate acid will be greater than the K b of the conjugate base, so the solution will be acidic, pH<7....
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This note was uploaded on 12/03/2008 for the course CHEM 142 taught by Professor Zoller,williamh during the Spring '07 term at University of Washington.

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216AcidBasesamplekey - resulting solution will be basic,...

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