The answers marked are correct. Just now sure on how to apprach these problems W

Question

The answers marked are correct. Just now sure on how to apprach these problems

Which of the following solutions could be mixed with 50.0 mL of 0.10 M HF in order to prepare a buffer? 25.0 mL of 0.10 M HCl 25.0 mL of 0.10 M NaOH 50.0 mL of 0.10 M NaF 50.0 mL of 0.20 M NaOH III only I and II II and III I, II, and III II, III, and IV Which of the following will give a buffer solution when equal volumes of the two solutions are mixed? 0.10 M HNO_3 and 0.10 M NaNO_3 0.10 M CH_3COOH and 0.10 M NaCH_3COO 0.10 M CH_3COOH and 0.20 M NaOH 0.10 M HNO_3 and 0.20 M NaCH_3COO II only I and II II and IV I, II, and IV II, III, and IV

Explanation / Answer

An acidic buffer is preapared by mixing a weak acid and its corresponding salt.

Thus,

The answer to the first question is, 50 mL of 0.10 M NaF (salt) solution could be mixed with 50 mL of 0.10 M HF (weak acid ) to prepare a buffer.

Answer to the second question is, a buffer is prepared by mixing equal volume of 0.10 M CH3COOH (weak acid) and 0.10 M NaCH3COO (salt)

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