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Which of the following solutions is a buffer? 1. 500 mL of 0.1 M HCl +...

Which of the following solutions is a buffer?

1. 500 mL of 0.1 M HCl + 500 mL of 0.2 M NaF

2. 500 mL of 0.1 M NaOH + 500 mL of 0.2 M NaF

3. 500 mL of 0.2 M HF + 500 mL of 0.1 M NaOH

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