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<Chapter 17 Homework Item 4 4 of 29 > Review | Constants 1 Periodic Table Part...

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<Chapter 17 Homework Item 4 4 of 29 > Review | Constants 1 Periodic Table Part A What is the pH of a solution prepared by mix
<Chapter 17 Homework Item 4 4 of 29 > Review | Constants 1 Periodic Table Part A What is the pH of a solution prepared by mixing 30.00 mL of 0.10 M CH,CO, H with 30.00 mL of 0.020 M CH,CO,K? Assume that the volume of the solutions are additive and that K = 1.8 x 10 for CH, CO,H. 4.75 2.87 O 5.44 4.05 Submit Request Answer Provide Feedback Next >

Answers

Question is based on concept of acidic buffer solution.PH is calculated by Henderson equation

[CH3COOK ] = 0.02 M x 30 mL / ( 30 + 30 ) mL = 0.01 M

[ CH3COOH] = 0.1 M x 30 mL / ( 30 + 30 ) mL = 0.05 M

PH = PKa + log {[ CH3COOK ] / [ CH3COOH]}
PH = —log ( 1.8 x 10–5 ) + log ( 0.01 M / 0.05 M )

= 4.74 - 0.69 = 4.05

.

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