Question

A titration is performed with a 25 mL analyze saturated solution of manganese (II) hydroxide with methyl orange indicator, titrated with .0045 M HCl. The end point was reached after 8.72 mL of HCl was added.

a) What is the molar concentration of OH

b) Calculate Ksp for the magnese hydroxide

c) What is the molar solubility of the manganese hydroxide?

Answer 1

(a) volume of Mr COH)₂ = 25 mL Volume of HU = 8.72 mL molarity of Hu= .0045 M (MV) Mn COH) = (MV) HU Mancow), X 25 - 8.924.0045 Mmncom), = 0.0392 25 = 1056x 103 m concentration of on = 1.56810 ou – Shx153 = 0.78x10 3M (6) MNCOH)2 Mut2 + 2014 Let the solubility bes Ksp = SX(28) I ksp = 2 453

(0) Ksp Of MN LOH)2 = 453 The value of ksp = 2.00x1013 2.00 xloB - 453 33 - 0'5x10-13 s3 = 0.05x1012 S = Voosx 1012 S= 0.368X10