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Consider the titration of a 26.0-mL sample of 0.180 M CH3NH2 with 0.145 M HBr. (The...

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Chemistry

Consider the titration of a 26.0-mL sample of 0.180 M CH3NH2with 0.145 M HBr. (The value of Kb for CH3NH2 is4.4×10−4.)

Already found:

volume of added acid required to reach the equivalencepoint.=32.3 ml

pH at 6.0 mL of added acid=11.28

pH at one-half of the equivalence point.= 10.64

Part A

Determine the initial pH

Part B

Determine the pH at the equivalence point.

Part C

Determine the pH after adding 5.0 mL of acid beyond theequivalence point.

Answer & Explanation Solved by verified expert
3.5 Ratings (327 Votes)
part A Kb 44 x 104 CH3NH2 H2O CH3NH3 OH 0180 x x x Kb x2 0180x 44 x 104 x2 0180x    See Answer
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