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An acidic buffer is obtained by mixing:
Option: 1 100 mL of 0.1 M CH₃COOH and 100 mL of 0.1 M NaOH
Option: 2 100 mL of 0.1 M HCl and 200 mL of 0.1 M CH₃COONa
Option: 3 100 mL of 0.1 M CH₃COOH and 200 mL of 0.1 M NaOH
Option: 4 100 mL of 0.1 M HCl and 200 mL of 0.1 M NaCl

Answers (1)

best_answer

An acidic buffer contains a weak acid and its salt.

Here,

Given the weak acid is CH₃COOH and its salt will be CH₃COONa

So,

100 mL of 0.1 M HCl = 10 meq HCl

200 mL of 0.1 M CH₃COONa = 20 meq of CH₃COONa

After mixing 10 meq of HCl react with 10 meq of CH₃COONa then 10meq of CH₃COOH form.

But from other options, the same amount of weak acid and its salt cannot be obtained.

Finally, 10meq of CH₃COOH and 10 meq of CH₃COONa will be present.

So upon mixing 100ml of 0.1M HCl and 200ml of 0.1M CH₃COONa, a buffer solution will be obtained.

Therefore, Option(2) is correct.

Posted by

Kuldeep Maurya

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