Chemical Forums
Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: guevara on December 20, 2014, 07:48:45 AM
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i have an exam after 2 days and i still can't answer this question
A piece of impure Zinc weighing 0.1 g was dissolved in 100 mL of dilute acid. 10 mL of this solution is adjusted to pH 10 and titrated against 12.4 mL of 0.01 M EDTA. If the atomic weight of Zn is 65.4, what is the percentage purity of zinc in the sample?
edit title, sjb
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i have an exam after 2 days and i still can't answer this question
A piece of impure Zinc weighing 0.1 g was dissolved in 100 mL of dilute acid. 10 mL of this solution is adjusted to pH 10 and titrated against 12.4 mL of 0.01 M EDTA. If the atomic weight of Zn is 65.4, what is the percentage purity of zinc in the sample?
How much EDTA did you use up? How does EDTA react with Zinc ion?
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i have an exam after 2 days and i still can't answer this question
A piece of impure Zinc weighing 0.1 g was dissolved in 100 mL of dilute acid. 10 mL of this solution is adjusted to pH 10 and titrated against 12.4 mL of 0.01 M EDTA. If the atomic weight of Zn is 65.4, what is the percentage purity of zinc in the sample?
How much EDTA did you use up? How does EDTA react with Zinc ion?
i have found it in paper questions , we didn't do it in practical
can you answer it in genaral or approximate range ?
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Answer sjb questions using data given in the problem.
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by the way, any reference for this method ? ASTM or ISO?