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Buffer

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AP Chemistry

Definition

A buffer is a solution that resists changes in pH when small amounts of an acid or a base are added to it.

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Practice Questions (4)

Which of the following is true about what occurs when an acid is added to a buffer?
What amount of solid sodium acetate is needed to prepare a buffer of pH 5.0 from 1.00 L of 0.10 M acetic acid (pKa = 4.75; molar mass of sodium acetate = 80.0343 g/mol)?
According to the Henderson-Hasselbalch equation, when the pH of a solution becomes equal to its pKa, the solution becomes a buffer. This condition is achieved when which of the following is true?
We want to make a 100 mL buffer with a pH of 5. We are given 0.1 M each of HA and NaA. How many mL of each are required to make the buffer? (pKa = 4.7)

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