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Автор - 200012364

рассчитайте значение ph в 0, 38%-ном
растворе гидроксида натрия плотность раствора 1002 г/л

Ответ

Автор - caesar
1. Находим молярную концентрацию NaOH:
C(NaOH)= frac{n(NaOH)}{V} = frac{m(NaOH)}{M(NaOH)} :frac{m}{p}=frac{w(NaOH).m}{M(NaOH)} .frac{p}{m}= frac{w(NaOH).p}{M(NaOH)}
= frac{0,0038.1002}{40} =0,0952 моль/л
2. NaOH=Na^+ + OH^-
[OH^-]=C(NaOH)=0,0952 моль/л
pOH=-lg[OH^-]=-lg0,0952=1,0214
pH=pK_w-pOH=14-1,0214=12,9786≈13
Ответ: pH≈13

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