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Consider the titration of a 28.0 mL sample of 0.175M CH3NH2 with a 0.145M HBr. Determine...

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Chemistry

Consider the titration of a 28.0 mL sample of 0.175M CH3NH2 witha 0.145M HBr. Determine each of the following.

I already got initial pH: 11.94 and the volume of added acidrequired to reach equivalence point: 33.8 mL.

I still need help with these:

1. The pH of 4.0 mL of added acid.

2. The pH at one-half of the equivalence point.

3. The pH of the equivalence point.

4. The pH after adding 4.0 mL of acid beyond the equivalencepoint.

Answer & Explanation Solved by verified expert
3.8 Ratings (369 Votes)
CH3NH2 H2O CH3NH3 OH Kb 4365x104 Kb x20175x x 000874 M Therefore initial pH 14 log000874 1194 1 Moles of CH3NH2 00280175 00049 Moles of HBr in 4mL 01450004 000058    See Answer
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