Harga pH larutan nh4cl (KB = 10-⁶) sama dengan pH larutan HCN 0,01 m (a = 1%). hitung konsentrasi garam nh4cl
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Jawaban:
[H+] NH4Cl = √Kw/Kb x Mg, Mg = molar garam
[H+] HCN = √Ka M
a = √Ka/M
a² = Ka/M
(0,01)² = Ka/0,01 M
Ka = 10^-6
[H+] NH4Cl = [H+] HCN
√(Kw/Kb x Mg x Valensi) = √(Ka M)
kuadratkan kedua ruas
Kw/Kb x Mg x Valensi = Ka M
10^-14/10^-6 x Mg x 1 = 10^-6 0,01 M
10^-8 Mg = 10^-8 M
Mg = 1 M
M NH4Cl = 1 M
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