Which of the following would form a buffer if added to 650.0 mL of 0.40 M Sr(OH)2?
(a) 1.00 mol of HF
(b) 0.75 mol of HF
(c) 0.30 mol of HF
(d) 0.30 mol of NaF
(e) 0.30 mol of HCl
Explain your reasoning in each case.
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