Chapter 9: Q9FE (page 207)

Find the pH of 0.050 M sodium butanoate (the sodium salt of
butanoic acid, also called butyric acid).

Short Answer

Expert verified

The of Sodium butanoate is 8.76.

Step by step solution

Th base dissociation constant

The K_b base dissociation constant is a measure of basicity or the strength of the base in general.

The value ofis:

$K_{b} = \frac{[{BH}^{+}] [{OH}^{-}]}{[B]}$

Where $K_{b}$ is called as base dissociation constant.

The value of $K_{w}$ is calculated by the formula,

$K_{w} = K_{a} \times K_{b}$

Step 2: Calculate the pH of 0.050M sodium butanoate

The chemical equation can be given as,

${CH}_{3} {CH}_{2} {CH}_{2} {CO}_{2}^{-} H_{2} O ⇌ {CH}_{3} {CH}_{2} {CH}_{2} {CO}_{2} H + {OH}^{-}$

The value of $K_{b}$ is calculated from the value of $K_{w}$ and $K_{a}$

$K_{b} = \frac{K_{w}}{K_{a}} = 6.58 \times 10^{- 10}$

$FromICEtable : \frac{x^{2}}{0.050 - x} = K_{b} x = \sqrt{(0.050) (6.58 \times 10^{- 10}) x} = 5.74 \times 10^{- 6} M$

The pH of weak base is calculated using the equation,

$pH = [H^{+}] = \frac{K_{w}}{[{OH}^{-}]} pH = - \log [H^{+}] pH = - \log [5.74 \times 10^{- 6} M] pH = 8.76$

The pH of 0.050M Sodium butanoate is 8.76.

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Find the pH of 0.050 M sodium butanoate (the sodium salt of
butanoic acid, also called butyric acid).

Short Answer

Step by step solution

Th base dissociation constant

Step 2: Calculate the pH of 0.050M sodium butanoate

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Find the pH of 0.050 M sodium butanoate (the sodium salt ofbutanoic acid, also called butyric acid).

Short Answer

Step by step solution

Th base dissociation constant

Step 2: Calculate the pH of 0.050M sodium butanoate

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Making Measurements

Chemical Analysis

Chemistry Branches

Chemical Reactions

Nuclear Chemistry

Organic Chemistry

Study anywhere. Anytime. Across all devices.

Find the pH of 0.050 M sodium butanoate (the sodium salt of
butanoic acid, also called butyric acid).