PROCEDURE Acidity 100 mL aliquots of the sample with a few drops of HCI, and boil gently for a few minutes to eliminate CO2. Cool, add 3 to 4 drops of methyl red, and neutralise with 0.1 M NaOH. Introduce 2 mL of pH-10 buffer, 3 to 4 drops of Eriochrome Black T, and titrate with the prepared standard NazHzY to a colour change from red to pure, blue (Note). Report the results in terms of milligrams of CaCO, per litre water. NOTE The colour change is sluggish if Mg? is absent. In this event, add 1 to 2mL of 0.1 Mg Y2- before starting the titration (see Section 36D-4 for the preparation of this solution). Data. Mass of NazH2Y.2H20 0,9989 g Titration Initial volume (ml) final volume (ml) Volume used (ml) ? 1 0,75 25.25 2 1.25 26,75 1,75 26,87 4 2,55 27.05 1.90 21.90

PROCEDURE Acidity 100 mL aliquots of the sample with a few drops of HCI, and boil gently for a few minutes to eliminate CO2. Cool, add 3 to 4 drops of methyl red, and neutralise with 0.1 M NaOH. Introduce 2 mL of pH-10 buffer, 3 to 4 drops of Eriochrome Black T, and titrate with the prepared standard NazHzY to a colour change from red to pure, blue (Note). Report the results in terms of milligrams of CaCO, per litre water. NOTE The colour change is sluggish if Mg? is absent. In this event, add 1 to 2mL of 0.1 Mg Y2- before starting the titration (see Section 36D-4 for the preparation of this solution). Data. Mass of NazH2Y.2H20 0,9989 g Titration Initial volume (ml) final volume (ml) Volume used (ml) ? 1 0,75 25.25 2 1.25 26,75 1,75 26,87 4 2,55 27.05 1.90 21.90

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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