An acidic buffer is obtained on mixing:
An acidic buffer is obtained on mixing:
Option 1 -
100 mL of 0.1M HCl and 200 mL of 0.1M NaCl
Option 2 -
100 mL of 0.1M HCl and 200 mL of 0.1M CH₃COONa
Option 3 -
100 mL of 0.1M CH₃COOH and 100 mL of 0.1M NaOH
Option 4 -
100 mL of 0.1M CH₃COOH and 200 mL of 0.1M NaOH
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1 Answer
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Correct Option - 2
Detailed Solution:An acidic buffer solution consists of a weak acid and its conjugate base (usually from a salt).
Let's analyze the options:
(A) Strong acid (HCl) and a neutral salt (NaCl). Not a buffer.
(B) 100 mL of 0.1M HCl (10 mmol) is mixed with 200 mL of 0.1M CH?COONa (20 mmol). The strong acid (HCl) will react completely with the conjugate base (CH?COONa):
HCl + CH?COONa → CH?COOH + NaCl
After reaction, we have (20-10) = 10 mmol of CH?COONa (conjugate base) and 10 mmol of CH?COOH (weak acid) are formed. This mixture of a weak acid and its conjugate base is an acidic buffer.
(C) 100 mL of 0.1M CH?COOH (10 mmol) and 100 mL of 0.1M NaOH (10 mmol). Th...more
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