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Topic: Zinc EDTA Titration question  (Read 3535 times)

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Offline guevara

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Zinc EDTA Titration question
« on: December 20, 2014, 07:48:45 AM »
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
« Last Edit: December 20, 2014, 08:03:38 AM by sjb »
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Offline sjb

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Re: Zinc EDTA Titration question
« Reply #1 on: December 20, 2014, 08:04:43 AM »
Quote from: guevara on December 20, 2014, 07:48:45 AM
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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Offline guevara

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Re: Zinc EDTA Titration question
« Reply #2 on: December 20, 2014, 08:29:12 AM »
Quote from: sjb on December 20, 2014, 08:04:43 AM
Quote from: guevara on December 20, 2014, 07:48:45 AM
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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Offline Borek

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Re: Zinc EDTA Titration question
« Reply #3 on: December 20, 2014, 10:08:54 AM »
Answer sjb questions using data given in the problem.
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ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline fedaai

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Re: Zinc EDTA Titration question
« Reply #4 on: December 22, 2014, 08:10:15 AM »
by the way, any reference for this method ? ASTM or ISO?
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