what is the ph of a buffer with 0.462 m acetic acid and 0.355 m acetate. the ka for acetic acid is: 1.8 x 10-5

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08-11-2022
Chemistry

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what is the ph of a buffer with 0.462 m acetic acid and 0.355 m acetate. the ka for acetic acid is: 1.8 x 10-5

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NGireesh NGireesh · Answer 1 · 2022-11-14T11:29:36+01:00

A buffer with 0.462 m acetic acid and 0.355 m acetate has a pH of 4.6. The acetic acid ka value is 1.8 x 10-5.

Buffer solution: What is it?

The pH of a buffer solution won't change when small amounts of an acid or an alkali are added.

Simply put, a buffer solution that is acidic has a pH that is lower than 7. Acidic buffer solutions are normally made using a weak acid and one of its salts, frequently a sodium salt.

Alkaline buffer solution has pH higher than 7. The most common method for producing alkaline buffer solutions is to combine a weak base with one of its salts.

pH = -logKa + log([C₂H₃O₂⁻] / [HC₂H₃O₂])

ph = -log(1.8 × 10⁻⁵) + log(0.355 M / 0.462 M)

ph = 4.6

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