Which will make basic buffer?
50 mL of 0.1 M NaOH + 25 mL of 0.1 M
100 mL of 0.1 M + 100 mL of 0.1 M NaOH
100 mL of 0.1 M HCl + 200 mL of 0.1 M
100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH
A basic buffer is formed by a weak base and its salt with a strong acid. In option (3), 200 mL of 0.1 M (weak base) reacts with 100 mL of 0.1 M HCl (strong acid). This leaves 100 mmol of and forms 100 mmol of (salt), which constitutes a basic buffer.
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