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5. 20ml 0.50N CH3COOH(aq) (Ka=2*10^-5) dilute with water 100ml and titrate with 0.50N NaOH, after added...

5. 20ml 0.50N CH3COOH(aq) (Ka=2*10^-5) dilute with water 100ml and titrate with 0.50N NaOH, after added 10ml NaOH(aq) calculate the current pH.

6. A weak acid HA water solution 20ml, titrate with 0.125N NaOH, when reach equivalence point, 40ml base salt is used and pH=9, please calculate Ka of acid HA.

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