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webacidbaseexam - CH186 Acid-Base Exam Questions From...

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CH186 Acid-Base Exam Questions From Spring 2001 Semester Useful constants: K w = 1.0 x 10 -14 ; pK w = 14.00 1. Short Answer a. Is an aqueous solution of the salt (C 5 H 5 NH)Br acidic, basic, or neutral? b. Is an aqueous solution of the salt CsNO 3 acidic, basic, or neutral? c. Consider the following weak acids and K a values: HA (K a = 10 -6 ), HB (K a = 10 - 2 ), HC (K a = 10 -4 ), HD (K a = 10 -8 ). Which of these acids is the strongest acid? d. Which of the acids in c above has the strongest conjugate base? e. For the following reaction, which species serves as the Lewis base: SO 3 + OH - HSO 4 - f. For the following reaction, label each chemical species as a Bronsted-Lowry acid (A) or base (B), and clearly indicate the conjugate acid-base pairs. H 2 PO 4 - + OH - H 2 O + HPO 4 2- g. Consider the following weak base ionization: B + H 2 O HB + + OH - . Will addition of a salt containing the HB + ion increase, decrease, or have no effect on the pH of a solution of weak base B? h. Give the formula for the conjugate base of HSO 3 - . 2. Indicate whether each of the following solutions is acidic, basic, or neutral at 25 ° C. a. pH = 2.5 d. [OH - ] = 0.0035 M b. [H 3 O + ] > [OH - ] e. pOH = 7.0 c. [H 3 O + ] = 1.0 x 10 -7 M f. pH = 10.0 3. A biologist regularly uses a buffer solution that contains Na 2 HPO 4 and NaH 2 PO 4 in his lab. Write a balanced chemical equation showing the reaction that takes place when (a) sodium hydroxide, NaOH, is added to the buffer, and (b) hydrobromic acid, HBr, is added to the buffer. (You may omit spectator ions.) 4 Calculate the pH for each of the following solutions at 25
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This note was uploaded on 10/20/2011 for the course CHEM CHEM 1202 taught by Professor Situma during the Spring '09 term at LSU.

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webacidbaseexam - CH186 Acid-Base Exam Questions From...

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