Chemistry, 10.08.2021 02:30, china1283

Tungsten trioxide (WO3) 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 WO3 content, a 10.29 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO3 to W3 . The resulting W3 was transferred to 500.0 mL of 1.00 M HCl. A 100.00 mL aliquot of the HCl solution required 11.27 mL of 0.09177 M potassium permanganate (KMnO4) to reach the purple endpoint. A blank required 0.08 mL. Use the reaction 3MnO4- + 5W3+ +4H+---> 3Mn2+ + 5WO22+ + 2H2O in order to determine the percent WO3 in the ceramic sample.

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Tungsten trioxide (WO3) has a rich yellow color and is often used as a pigment in ceramics and paint...