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A 1.200-g sample of a mixture of NaOH (FW 40.00 g/mol) and Nancog (FW 105.99 g/mol) with inert impurity is dissolved and titrated with 0.500 M HCI. With phenolphthalein as the indicator, the solution turns colorless after the addition of 30.00 mL of the acid. Methyl orange is then added, and 5.00 mL more of the acid is required for the color to change to pink. What is the percentage of NaOH in the sample?

A 1.200-g sample of a mixture of NaOH (FW 40.00 g/mol) and Nancog (FW 105.99 g/mol) with inert impurity is dissolved and titrated with 0.500 M HCI. With phenolphthalein as the indicator, the solution turns colorless after the addition of 30.00 mL of the acid. Methyl orange is then added, and 5.00 mL more of the acid is required for the color to change to pink. What is the percentage of NaOH in the sample?

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 93QRT: When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence...
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A. 22.08% B. 20.74% C.83.34% D. 20.84%
A 1.200-g sample of a mixture of NaOH (FW 40.00 g/mol) and NanCog (FW 105.99 g/mol) with inert impurity is dissolved and titrated with 0.500 M HCI. With phenolphthalein as the indicator, the solution turns colorless after the addition of 30.00 mL of the acid. Methyl orange is then added, and 5.00 mL more of the acid is required for the color to change to pink. What is the percentage of NaOH in the sample?
Transcribed Image Text:A 1.200-g sample of a mixture of NaOH (FW 40.00 g/mol) and NanCog (FW 105.99 g/mol) with inert impurity is dissolved and titrated with 0.500 M HCI. With phenolphthalein as the indicator, the solution turns colorless after the addition of 30.00 mL of the acid. Methyl orange is then added, and 5.00 mL more of the acid is required for the color to change to pink. What is the percentage of NaOH in the sample?
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