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Potassium Dichromate

What would be...

Question

What would be the the mass of NaOH added to 200ml of a 0.10M HOBr solution to produce a buffer of solution of pH8.3 (K_a of HOBr=2×10^{-9}):- (1)3.67g (2)0.37g (3)0.037g (4)3.07g

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