Question

what volume of 0.1M HCOONa solution should be added to 50ml of 0.05M formic acid to produce a buffer solution of pH =4.0 (pKa of formic acid =3.7)
(a) 50ml. (b) 40ml
(c) 30ml. (d) 60ml
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Answer 1

Answer:

60 is the answer of what you have asked