Note 331 — Chapter IX · SYSTEMATIC ANALYSIS FOR THE COMMON METAL IONS. THE IONS OF THE ALKALIES AND OF THE ALKALINE EARTHS. ORDER OF PRECIPITATION OF DIFFICULTLY SOLUBLE SALTS WITH A COMMON ION
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From equation (I) we obtain directly, by the application of a simple mathematical transformation, that [NH3] + [NH4OH] / [NH4OH] = kNH3 + 1 = k′, and, therefore, [NH4OH] = [NH3] + [NH4OH] / k′. Inserting this value for [NH4OH] in equation (II) and transferring k′, we have [NH4+] × [HO−] / ([NH3] + [NH4OH]) = kbase / k′ = K.