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Which of the following gives a buffer solution when equal volumes of the two solutions are...

Which of the following gives a buffer solution when equal volumes of the two solutions are mixed? You will want to write net ionic equations in order to answer these questions correctly. Explain your answer.

a. 0.10 M HF and 0.10 M NaF

b. 0.10 M HF and 0.19 M NaOH

c. 0.20 M HF and 0.10 M NaOH
d. 0.10 M HCl and 0.20 M NaF

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