A 4.298 g sample of the mineral tellurite (TeO2) was dissolved in acid. A 50.00 mL...

Question

Question

A 4.298 g sample of the mineral tellurite (TeO2) was dissolved in acid. A 50.00 mL volume of a 0.02842 M K2Cr2O7 solution was added.

3 TeO2 s+ Cr2O72- aq+8 H+ aq3 H2TeO4 aq+2 Cr3+ aq+H2O l

When the reaction is complete, the excess Cr2O72– is back-titrated, requiring 13.76 mL of 0.1062 M Fe2+ to reach the end point.

a) Use appropriate half-reactions to write the balanced reaction equation for the back-titration of the excess Cr2O72– with Fe2+. (3 pts)

b) Determine the %TeO2 in the mineral sample. (5 pts)

science chemistry

Answer 1

Answer #1

Answer 2

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