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কোন দ্রবণের ক্ষেত্রে ( p H=p K_ w ) i. ( 100 ~mL 0.1 M HCOOH+100 ~mL ) ( 0.1 M HCOONa ) ii. ( 100 ~mL 0.5 ~N CH_ 3 COOH+50 ~mL ) ( 0.5 M NaOH ) iii. ( 200 ~mL 0.1 M NH NH_ 4 OH+100 | Suva Ai