You are asked to determine the alkali present and the percentage of each in a component of a sample material containing components of NaOH, Na,CO, and NaHCO, or mixtures of this together with inert material. Each sample being tested weighs 2g and uses 0.25N hydrochloric acid for neutralization. Sample 1: Using phenolphthalein Indicator, 48.64ml acid was used. A duplicate sample needed 97.28ml of acid was used with methyl orange indicator. Sample 2: No color change using phenolphthalein as an indicator but with methyl orange 76.94ml acid is required. Sample 3. To cause a color change, the sample was titrated cold with phenolphthalein, 30.58ml of acid is necessary, and an additional 33.19ml was required for complete neutralization Sample 4: The process required 79.92ml of acid until the pink of phenolphthalein disappeared. On adding the excess of the acid, boiling and titrating back with alkali, it was found that the alkali was exactly equivalent to the excess acid added.

You are asked to determine the alkali present and the percentage of each in a component of a sample material containing components of NaOH, Na,CO, and NaHCO, or mixtures of this together with inert material. Each sample being tested weighs 2g and uses 0.25N hydrochloric acid for neutralization. Sample 1: Using phenolphthalein Indicator, 48.64ml acid was used. A duplicate sample needed 97.28ml of acid was used with methyl orange indicator. Sample 2: No color change using phenolphthalein as an indicator but with methyl orange 76.94ml acid is required. Sample 3. To cause a color change, the sample was titrated cold with phenolphthalein, 30.58ml of acid is necessary, and an additional 33.19ml was required for complete neutralization Sample 4: The process required 79.92ml of acid until the pink of phenolphthalein disappeared. On adding the excess of the acid, boiling and titrating back with alkali, it was found that the alkali was exactly equivalent to the excess acid added.

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

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 102AP

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