Chemistry, asked by daksh781, 1 year ago

Calculate the ionic strength of a benzoic acid/sodium benzoate buffer solution

Answers

Answered by FelixDan

Calculate the ionic strength of a benzoic acid/sodium benzoate buffer solution:

➡In that equation, the acid and base are a conjugate acid/base pair. We assume HCl quantitatively dissociates and protonates benzoates. The concentration of the acid increases, and the base decreases.

Empirically, the pH should go down in this case. Without seeing your specific calculation, we can't comment where you are going wrong, but the proper flow should look something like:

pH=pKa+Log10([base]−[AddedH][acid]+[AddedH])

pH=pKa+Log10(0.39M−0.036M0.10M+0.036M)

pH=pKa+Log10(0.354M0.136M)

From your calculated pKa=4.20, you should get there pretty quickly.

Just applying the difference in the log values of the changed ratios, I get pH=4.61

Hope it helps you:)

Please press the crown above my answer..

Previous Question

Next Question

Similar questions

English, 7 months ago

2. Place a tick (~) beside the topics that are referred to in the advisory. a. being open and respectful b. sharing knowledge, skills and interests c. dealing with racial comments and attacks d. clarity and confidence of communication e. making friends with the opposite sex f. understanding the history of ethnic groups g. managing finances h. importance of socializing and making friends i.