Which of the following would form a buffer if added to 250.0 mL of 0.150 M SnF2?
(a) 0.100 mol of HCl
(b) 0.060 mol of HCl
(c) 0.040 mol of HCl
(d) 0.040 mol of NaOH
(e) 0.040 mol of HF
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