Chemistryreviewquestions13Nov09

Chemistryreviewquestions13Nov09 - 1. Which of the following...

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1. Which of the following compounds is not an Arrhenius acid? A) HCl B) H 2 SO 4 C) H 2 O D) FeCl 3 E) H 2 S According to Arrhenius concept, an acid is a substance that dissociates in water to form H + in solution. FeCl 3 does not satisfy this definition for Arrhenius acid. It is more appropriately classified as Lewis acid. Water on the other hand, can be a Lewis acid because it can undergo dissociation to give H + , though only in slight extent. 2. Which of the following is not a Brønsted base? A) PF 5 B) H 2 O C) NH 3 D) S 2- E) CN - Bronsted base is proton-acceptor. Species in B, C, D and E are all capable of accepting protons to form conjugate acids. PF 5 is not a proton-acceptor. 3. Which one of the following is the strongest acid? A) CH 3 COOH (Ka = 1.8 x 10 -5 ) B) HCOOH (Ka = 1.0 x 10 -4 ) C) HClO (Ka = 3.0 x 10 -8 ) D) HF (Ka = 6.8 x 10 -4 ) The greater is Ka, the stronger is the acid. 4. What is the hydroxide ion concentration of a solution with pH = 5.14? A) 1.0 x 10 -14 B) 1.4 x 10 -9 C) 1.0 x 10 -7 D) 7.2 x 10 -6 E) 1.4 x 10 -2 pOH = 14 – pH = 14 – 5.14 pOH = 8.86
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[OH - ] = antilog (–pOH) [OH - ] = antilog -8.86 [OH - ] = 1.38 x 10 -9 5. Consider the following reaction: H 2 PO 4 - (aq) + HCO 3 -(aq) ↔ H 2 CO 3 (aq) + HPO 4 2- (aq) Brønsted would identify the acidic species as: A) H 2 PO 4 - and H 2 CO 3 B) H 2 PO 4 - and HPO 4 2- C) HCO 3 - and H 2 CO 3 D) HCO 3 - and HPO 4 2- E) H 2 CO 3 and HPO 4 2- Bronsted acid is proton-donor. For the forward reaction, H 2 PO 4 - is the proton-donor, while for the backward reaction, H 2 CO 3 is the proton donor. 6. What is the pH of a 0.0001 M HBr solution? A) 1 B) 4 C) 5 D) 8 E) 10 pH = -log 0.0001 pH = 4 7. If the pH of a solution is increased by one point, the proton concentration: A) is decreased by a factor of one. B) is decreased by a factor of ten. C) is increased by a factor of one. D) is increased by a factor of ten. E) does not change.
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Chemistryreviewquestions13Nov09 - 1. Which of the following...

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