A 25.00 ml of Ni2* solution was diluted in HCI and treated with 25.00 ml of 0.05283 M NazEDTA. The solution was neutralized with NaOH followed by addition of acetate buffer unti the pH 5.5. The solution turns yellow after addition of few drops of xylenol orange indicator Back titration using standard 0.022 MZn2 at pH 5.5 requires 17.61 ml until end point, or which the solution will turn red. Calculate for the molarity of the unknown. Ans. 0.03664 M

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
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Chapter16: Applications Of Neutralization Titrations
Section: Chapter Questions
Problem 16.40QAP
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A 25.00 ml of Ni2* solution was diluted in HCI and treated with 25.00 ml of 0.05283 M
NazEDTA. The solution was neutralized with NaOH followed by addition of acetate buffer until
the pH 5.5. The solution turns yellow after addition of few drops of xylenol orange indicator.
Back titration using standard 0.022 MZn2* at pH 5.5 requires 17.61 ml until end point, on
which the solution will turn red. Calculate for the molarity of the unknown. Ans. 0.03664 M
Transcribed Image Text:A 25.00 ml of Ni2* solution was diluted in HCI and treated with 25.00 ml of 0.05283 M NazEDTA. The solution was neutralized with NaOH followed by addition of acetate buffer until the pH 5.5. The solution turns yellow after addition of few drops of xylenol orange indicator. Back titration using standard 0.022 MZn2* at pH 5.5 requires 17.61 ml until end point, on which the solution will turn red. Calculate for the molarity of the unknown. Ans. 0.03664 M
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