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
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
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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Transcribed Image Text:PROBLEM 3:
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.
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