**Tungsten Trioxide (WO₃) Analysis**Tungsten trioxide (WO₃) is notable for its rich yellow color and is frequently used as a pigment in ceramics and paints. To test the WO₃ content of a ceramic vase, a 10.15 g sample was prepared and reduced with Pb(Hg) to convert any WO₃ to W³⁺. The W³⁺ ions were then transferred to 500.0 mL of 1.00 M HCl. Using a 100.00 mL aliquot of this HCl solution, titration required 14.78 mL of 0.08271 M potassium permanganate (KMnO₄) to reach the purple endpoint. A blank titration required 0.26 mL.**Task: Balance the Redox Reaction**The redox reaction in question is:\[ \text{MnO}_4^- + \text{W}^{3+} \rightarrow \text{Mn}^{2+} + \text{WO}_2^{2+} \]**Calculate the Percent WO₃ in the Ceramic Sample**\[ \text{percent WO}_3: \quad \_\_\_\_\_\_\_\_\_\_\_ \% \]

For balancing in acidic medium, O is balanced by using H2O and H-atom is balanced by addition of H+ to opposite side. Thus above is the balanced redox reaction.

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Tungsten trioxide (WO,) has a rich yellow color and is often used as a pigment in ceramics and paints. To test a ceramic vase for its WO, content, a 10.15 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO, to W3+. The resulting W3+ was transferred to 500.0 mL of 1.00 M HCI. A 100.00 mL aliquot of the HCl solution required 14.78 mL of 0.08271 M potassium permanganate (KMNO,) to reach the purple endpoint. A blank required 0.26 mL. Balance the redox reaction. redox reaction: |MnO + w3+ Mn2+ + WO3+ Determine the percent WO, in the ceramic sample. percent WO3: 70

Tungsten trioxide (WO,) has a rich yellow color and is often used as a pigment in ceramics and paints. To test a ceramic vase for its WO, content, a 10.15 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO, to W3+. The resulting W3+ was transferred to 500.0 mL of 1.00 M HCI. A 100.00 mL aliquot of the HCl solution required 14.78 mL of 0.08271 M potassium permanganate (KMNO,) to reach the purple endpoint. A blank required 0.26 mL. Balance the redox reaction. redox reaction: |MnO + w3+ Mn2+ + WO3+ Determine the percent WO, in the ceramic sample. percent WO3: 70

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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