1.

(a) The pH of black coffee is 5.0. Calculate the hydrogen ion concentration.(b) The Ksp of barium sulphate is 1.5 × 10-9 . Calculate the solubility of barium sulphate in pure water.Calculate the solubility of barium sulphate in pure water.

Answer»

(a) -log[H+] = 5 Or  log[H+] = -5

∴ [H+] = antilog(-5) = 10-5

(b) BaSO4(s) ⇌ Ba2+(aq) + SO42-(aq)

Ksp = [Ba2+][SO42-] = S2 

∴ S = \(\sqrt{K_{sp}}\) = \(\sqrt{1.5\times10^{-9}}\) = 3.873 x 10-5



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