Chemistry, 03.12.2021 06:30 graciewyatt6833
Concentration of calcium in a sample may be determined by precipitation using the chromate ion, Crom-.
Ca2+ (aq) + Cro - (aq) — CaCro,(s)
A chemist combined 0.180 L of an unknown calcium solution with an excess of ammounium chromate. This resulted in the
precipitation of calcium chromate. The mass of the precipitate was 282.7 mg. What was the molar concentration of Ca2+ in the
original sample?
[Ca2+] =? M
Answers: 2
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