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The value of pH for buffer which is a mixture of Acetic acid and Sodium acetate is
1. 4.75
2. 1.58
3. 9.25
4. 7.42

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Correct Answer - Option 1 : 4.75

Explanation:

  • pH: The negative of the logarithm to base 10 of the concentration of hydrogen ions, measured in moles per liter.
  • A measure of acidity or alkalinity of a substance, which takes numerical values from 0 (maximum acidity) through (neutral) to 14 (maximum alkalinity).
  • Buffer: A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer.
  • Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added.

Buffer can be classified into two types;

  • Acidic Buffer: The buffer is formed from the solution of a weak acid and its salt of a strong base. acid. Acidic buffers generally have a pH of less than 7.
    • Example of an acidic buffer is CH3COOH and CH3COONa.
  • Basic Buffer: The buffer is formed from the solution of a weak base and its salt with a strong acid. basic buffers have a pH of more than 7.
    • Example of the basic buffer is NH4OH and NH4Cl.
  • A mixture of Acetic acid and Sodium acetate acts as a buffer solution around pH 4.75.
  • A mixture of NH4OH and NH4Cl act as buffer solution around pH 9.25.

Hence, we conclude that The value of pH for a buffer which is a mixture of Acetic acid and Sodium acetate is 4.75

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