what is the ph of a buffer in which the concentration of benzoic acid, c6h5cooh, is 0.075 m and the concentration of sodium benzoate, nac6h5coo, is 0.050 m ?

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08-11-2022
Chemistry

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what is the ph of a buffer in which the concentration of benzoic acid, c6h5cooh, is 0.075 m and the concentration of sodium benzoate, nac6h5coo, is 0.050 m ?

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kjuli1766 kjuli1766 · Answer 1 · 2022-11-11T11:35:03-05:00

The answer is 4.02.

Benzoic acid is a weak acid and sodium hydroxide is a strong base. Benzoic acid and sodium hydroxide react to form sodium acetate and water to form a buffer solution. pH can be measured by measuring the voltage developed between two special electrodes immersed in a liquid solution.

Special glass electrodes are called measuring electrodes. It neutralizes benzoic acid to produce benzoate ions, which enter the water layer, leaving two other organic compounds in the ether. Similarly, nitroaniline does not dissolve under neutral or basic conditions but dissolves in acidic solutions. This clearly shows that formic acid is a stronger acid than benzoic acid.

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