How many mole of HCl are required to prepare 1 L of buffer solution ( containing NaCN+ HCl) of pH 8.5 using 0.01 g formula mass of NaCN (K of HCN = 4.1 × 10^ )
a. 8.85× 10^-3
b.8.75× 10^-2
c . 8.85×10^-4
d. 8.85×10^-2
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