Q 2613212149.     A buffer solution is made by mixing a weak acid HA (`K = 10^-6`) with its salt NaA in equal amounts. What should be the amount of acid or salt that should be added to make 90 ml of buffer solution of buffer capacity 0.1 ?

A

10 mmoles

B

22 mmoles

C

9 mmoles

D

11 mmoles

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