Acids - Acids Bases 1 For the following reaction of benzoic...

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Acids & Bases 1. For the following reaction of benzoic acid (HOBz) with water, HOBz + H 2 O <==> H 3 O + + OBz - which of the following statements is correct? a. HOBz and H 3 O + are a conjugate acid/base pair. b. HOBz and OBz - are a conjugate acid/base pair. c. HOBz and H 2 O are a conjugate acid/base pair. d. H 2 O and OBz - are a conjugate acid/base pair. e. H 2 O and H 3 O + are the only conjugate acid/base pair in the reaction. 2. What is the pH of a solution that contains 2.5 x 10 -5 M hydronium ion? 3. What is the molar concentration of hydroxide ion, [OH - ], in a water solution that contains 2.5 x 10 - 4 hydronium ion (H 3 O + )? 4. What is the molar hydroxide ion concentration, [OH - ], in a solution with pH = 7.63? 5. For the following reaction of acetic acid (HOAc) with water, HOAc + H 2 O <==> H 3 O + + OAc - which of the following statements is correct? a. HOAc and H 3 O + are a conjugate acid/base pair. b. HOAc and H 2 O are a conjugate acid/base pair. c. H 2 O and OAc - are a conjugate acid/base pair. d. HOAc and OAc - are a conjugate acid/base pair. 6. Calculate the pH of a 0.042 M solution of hydrobromic acid (HBr). 7. If we gradually increase the concentration of a strong acid in water without changing the volume significantly, then the: a. concentrations of hydronium and hydroxide ion will both increase. b. concentrations of hydronium and hydroxide ion will both decrease. c. hydronium ion concentration will decrease and the hydroxide ion concentration will increase. d. hydronium ion concentration will increase and the hydroxide ion concentration will decrease. e. concentrations of hydronium and hydroxide ion will be unaffected. 8. Which of the following is the conjugate base of H 2 PO 4 - ? a. H 3 PO 4 b. HPO 4 - c. HPO 4 2- d. PO 4 3- e. PO 4 2- 9. The scale on the pH meter used in the laboratory ranges from pH = 0 to pH = 14. The range of hydronium ion concentrations represented by this scale is: a. 14 fold. b. 1 x 10 7 fold. c. 1 x 10 -7 fold. d. 1 x 10 14 fold. e. none of the above is correct. 10. Which of the following is NOT a Bronsted-type acid-base reaction? a. NH 3 (aq) + H 3 O + (aq) <=> NH 4 + (aq) + H 2 O (l) b. OH - (aq) + HNO 3 (aq) <=> H 2 O (l) + NO 3 - (aq) c.
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