2,7 gram HCN (Mr. HCN = 27) dilarutkan dalam 100 ml larutan. Hitunglah konsentrasi ion H+

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Ka.HCN=4,7×10^–10.

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2,7 gram HCN (Mr. HCN = 27) dilarutkan dalam 100 ml larutan. Hitunglah konsentrasi ion H+

5.4 gram HCN

Mr = 27

mol = 5.4 / 27 = 0.2 mol = 200 mmol

volume = 100 ml

Molaritas = mol / volume

= 200 / 100

= 2 M

Ka = 4.7 x 10⁻¹⁰

[H⁺] = sqrt{Ka.M}

Ka.M

= sqrt{4,7. 10^{-10}.2 }

4,7.10

−10

.2

= 3,06 x 10⁻⁵

pH = 5 – log 3,06