Question

6. What is [H3O+] in a solution of 0.075M HNO2 and 0.030M NaNO, Ka of HNO2 = 4.5x10-5

Answer 1

We know that, Gaven, [salt] - [ NaNO₂] = 0·030M [Acid] = [HNO,] = 0·075M ka = 4:58 105 pka = - log ka = - log (4.5x105) = - [log 4.5+ log 10 --[log 4:5 – 5 log 10] = 5-0.6532 = 4.34 0-030 pH = 4.34 + log 0.075 = 4.34 + (log 0.030 + log 0075

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