2) A 100.0 mL sample of drinking water was treated with ammonia buffer and after addition of Eriochrome Black T indicator, required 18.0 mL of 0.00559 M EDTA for titration. (a) Identify the role of ammonia buffer in the analysis. (b) Identify the indicator and endpoint color. (c) Calculate the total hardness of the water sample as ppm CaCO

2) A 100.0 mL sample of drinking water was treated with ammonia buffer and after addition of Eriochrome Black T indicator, required 18.0 mL of 0.00559 M EDTA for titration. (a) Identify the role of ammonia buffer in the analysis. (b) Identify the indicator and endpoint color. (c) Calculate the total hardness of the water sample as ppm CaCO

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter20: Molecular Spectroscopy And Photochemistry

Section: Chapter Questions

Problem 67CP

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WARIARTAM 2. 1.2589 g of a certain brand of milk powder required 25.89 mL of 0.01873M EDTA to titrate the calcium contained in the sample. (a) What is the percent calcium in the sample? (b) Would the true result be higher, lower, or not be affected if the milk powder sample has been slightly wet?
The phosphate in a 3.000-g sample of industrial detergent was precipitated by the addition of 1.000 g of AgNO3. The solution was filtered and filtrate, upon addition of 1.00 mL of 0.01 M fecl3, required 18.23 mL of 0.1377 M KSCN for titration to the end point. (a) the weight percent of phosphate in the detergent
a 20 ml portion of a deep well water sample was diluted to 250 ml solution. a 50 ml aliquot of this diluted sample water was buffered at ph 10 and required 8. 50 ml of a standard EDTA.the titrant was standardized using 100ml containing 0.8622 mg primary standard calcium carbonate , which required 15.45 ml for titration.(a) identify a possible indicator and its endpoint color (b) calculate the molarity of the EDTA solution. (c) calculate the total hardness of the water as ppm CaCO3 (d) identify the quality of the water sample in terms of hardness
Five drops of dichlorofluorescein have been added to a solution containing 0.800 g sample which required 25.30 mL of 0.100 M AgNO3. (a) Identify the type of argentometric titration method used.
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