Q19.26P What is the component concentrat... [FREE SOLUTION]

Chapter 19: Q19.26P (page 873)

What is the component concentration ratio, $[{CH}_{3} {COO}^{-}] / [{CH}_{3} COOH]$ , of a buffer that has a pH of 4.39 ( $K_{a}$ of $[{CH}_{3} COOH] = 1.8 脳 10^{- 5}$ )?

Short Answer

Expert verified

The component concentration ratio obtained is $\frac{[{CH}_{3} {COO}^{-}]}{[{CH}_{3} COOH]} = 0.45.$ $\frac{[{CH}_{3} {COO}^{-}]}{[{CH}_{3} COOH]} = 0.45.$

Step by step solution

Buffer solution

The pH value of an acidic buffer solution can be determined by using the formula below:

$pH = pKa + \log \frac{[salt]}{[acid]}$

Explanation

First, write the ${CH}_{3} COOH$ dissociation process.

${CH}_{3} {COOH +H}_{2} O 鈬� H_{3} O^{+} {+ CH}_{3} {COO}^{-} .$

We must alter the Henderson-Hassle Balch equation for solving $\frac{[{CH}_{3} {COO}^{-}]}{[{CH}_{3} COOH]}$ . The pH and $K_{a}$ are given. Therefore, first solve for the ${pK}_{a}$ .

${pK}_{a} {= - logK}_{a} = - \log (1.8 脳 10^{- 5}) = 4.74$

Then alter the Henderson-Hassle Balch equation to find the answer for

$\frac{[{CH}_{3} {COO}^{-}]}{[{CH}_{3} COOH]} .$

role="math" ${pH = pK}_{a} + log \frac{[{CH}_{3} {COO}^{-}]}{[{CH}_{3} COOH]} log \frac{[{CH}_{3} {COO}^{-}]}{[{CH}_{3} COOH]} {= pH - pK}_{a} \frac{[{CH}_{3} COO -]}{[{CH}_{3} COOH]} {= 10}^{{pH - pK}_{a}} {= 10}^{4.39 - 4.74} = 0.45.$

Therefore, the component concentration ratio obtained is $\frac{[{CH}_{3} {COO}^{-}]}{[{CH}_{3} COOH]} = 0.45$ .

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What is the component concentration ratio, $[{CH}_{3} {COO}^{-}] / [{CH}_{3} COOH]$ , of a buffer that has a pH of 4.39 ( $K_{a}$ of $[{CH}_{3} COOH] = 1.8 脳 10^{- 5}$ )?

Short Answer

Step by step solution

Buffer solution

Explanation

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91影视

What is the component concentration ratio, [CH3COO-]/[CH3COOH], of a buffer that has a pH of 4.39 ( Kaof [CH3COOH]=1.8脳10-5)?

Short Answer

Step by step solution

Buffer solution

Explanation

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Kinetics

Chemical Reactions

Inorganic Chemistry

Nuclear Chemistry

Organic Chemistry

Chemical Analysis

Study anywhere. Anytime. Across all devices.

What is the component concentration ratio, $[{CH}_{3} {COO}^{-}] / [{CH}_{3} COOH]$ , of a buffer that has a pH of 4.39 ( $K_{a}$ of $[{CH}_{3} COOH] = 1.8 脳 10^{- 5}$ )?