K2CrO4 is added to a 40.0 mL solution containing Co2+. The resulting CoCrO4 precipitate is filtered, washed, and then dissolved using dilute H2SO4. The resulting Cr2O7 2- is titrated with 0.2212 M Fe2+. The endpoint was reached following the addition of 44.58 mL. Calculate the concentration of Co2+ in the original solution

K2CrO4 is added to a 40.0 mL solution containing Co2+. The resulting CoCrO4 precipitate is filtered, washed, and then dissolved using dilute H2SO4. The resulting Cr2O7 2- is titrated with 0.2212 M Fe2+. The endpoint was reached following the addition of 44.58 mL. Calculate the concentration of Co2+ in the original solution

Chemistry by OpenStax (2015-05-04)

1st Edition

ISBN:9781938168390

Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Chapter15: Equilibria Of Other Reaction Classes

Section: Chapter Questions

Problem 10E: The Handbook of Chemistry and Physics (http://openstaxcollege.org/l/16Handbook) gives solubilities...

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The Handbook of Chemistry and Physics (http://openstaxcollege.org/l/16Handbook) gives solubilities of the following compounds in grams per 100 mL of water. Because these compounds are only slightly soluble, assume that the volume does not change on dissolution and calculate the solubility product for each. (a) BaSiF6, 0.026 g/100 mL (contains SiF62- ions) (b) Ce(IO3)4, 1.5102 g/100 mL (c) Gd2(SO4)3, 3.98 g/100 mL (d) (NH4)2PtBr6, 0.59 g/100 mL (contains PtBr62- ions)
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For the determination of Ca in blood serum, 5 mL of a serum sample is taken and the Ca2 + in it is precipitated as CaC2O4. The precipitate is filtered, dissolved in acid and titrated with 0.001 M KMnO4 by heating. Calculate the Ca concentration in the sample since 4.94 mL of KMnO4 was used. A. 0.00135 B. 0.00247 C. 0.1135 D. 0.00563
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