Tungsten trioxide (WO_3) has a rich yellow color and is often used as a pigment

Question

Tungsten trioxide (WO_3) has a rich yellow color and is often used as a pigment in ceramics and paints. In order to test a ceramic vase for its WO_3 content, a 10.08 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO_3 to W^3+. The resulting W^3+ was transferred to 500.0 mL of 1.00 M HCl. A 100.00 mL aliquot of the HCI solution required 13.31 ml_of 0.09893 M potassium permanganate (KMnO_4) to reach the purple endpoint. A blank required 0.14 mL. Balance the reaction below and determine the percent WO_3 in the ceramic sample. MnO^-_4 + w^3+ rightarrow Mn^2+ + WO^2+_2

Explanation / Answer

3 MnO4{-} + 5 W{3+} + 4 H{+} = 3 Mn{2+} + 5 WO2{2+} + 2 H2O

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