How many mole of HCl are required to pre...

How many mole of HCl are required to prepare one litre of buffer solution (conataining NaCN+HCl) of ph 8.5 using 0.01 g formula weight of NaCN(K_(HCN)=4.1xx10^(-10)?

`8.85xx10^(-3)`

`8.75xx10^(-2)`

`8.85xx10^(-4)`

`8.85xx10^(-2)`

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