Urgent Help 1. Which process best accounts for the numerical value of the equiva

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Urgent Help

1. Which process best accounts for the numerical value of the equivalence-point pH after the titration of formic acid, HCOOH with NaOH?

A. HCOO- (aq) + H2O (l) <--------> HCOOH (aq) + OH- (aq)

B. HCOOH(aq) + H2O(l) <------->   -COOH (aq) + H3O+ (aq)

C. HCOOH (aq) + H3O+ (aq) <--------> HCOOH2+ (aq) + H2O(l)

D. HCOOH(aq) + H2O(l) <-------> HCOOH2+ (aq) + OH- (aq)

2.Which volume of 0.234 M HCl must be added to 45.0 mL 0.432 M CH3NH2 (Kb = 3.70 x 10-4) to reach a pH of 11.21?

A.   5.00 mL

B. 11.6 mL

C. 14.0 mL

D. 83.0 mL

A. HCOO- (aq) + H2O (l) <--------> HCOOH (aq) + OH- (aq)

B. HCOOH(aq) + H2O(l) <------->   -COOH (aq) + H3O+ (aq)

C. HCOOH (aq) + H3O+ (aq) <--------> HCOOH2+ (aq) + H2O(l)

D. HCOOH(aq) + H2O(l) <-------> HCOOH2+ (aq) + OH- (aq)

Explanation / Answer

1-A

2-C

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