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Calculate the pH for each of the following cases in the titration of 25.0 mL of...

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Chemistry

Calculate the pH for each of the following cases in thetitration of 25.0 mL of 0.150 M pyridine, C5H5N(aq) with 0.150 MHBr(aq): (a) before addition of any HBr (b) after addition of 12.5mL of HBr (c) after addition of 14.0 mL of HBr (d) after additionof 25.0 mL of HBr (e) after addition of 30.0 mL of HBr

Answer & Explanation Solved by verified expert
4.3 Ratings (936 Votes)
Kb of C5H5N 170109 awhen 00 mL of HBr is added C5H5N dissociates as C5H5N H2O C5H5NH OH 015 0 0 015x x x Kb C5H5NHOHC5H5N Kb xxcx Assuming x can be ignored as compared to c So above expression becomes Kb xxc so x sqrt Kbc x sqrt 17109015 1597105 since c is much greater than x our assumption is correct so x 1597105 M So OH x 1597105 M use pOH log OH log 1597105 47967 use PH 14 pOH 14 47967 92033 Answer 920 bwhen 125 mL of HBr is added Given MHBr 015 M VHBr 125 mL MC5H5N 015 M VC5H5N 25 mL molHBr MHBr VHBr molHBr 015 M 125 mL    See Answer
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