Sodium carbonate can coexist with either NaOH or NaHCO, but not with both simultaneously, since they would react to form Na,CO,. Sodium hydroxide and Na,CO, will titrate together to a phenolphthalein end point (OH-¯→ H¸O; CO,²-→ HCO,¯). A mixture of either NaOH and Na,CO, or of Na,CO, and NaHCO, is titrated with HCI. The phenolphthalein end point occurs at 15.0 mL and the modified methyl orange end point occurs at 50.0 mL (35.0 mL beyond the first end point). The HCI was standardized by titrating 0.477 g Na,CO,, requiring 30.0 mL to reach the modified methyl orange end point. What mixture is present and how many millimoles of each constituent are present?

Sodium carbonate can coexist with either NaOH or NaHCO, but not with both simultaneously, since they would react to form Na,CO,. Sodium hydroxide and Na,CO, will titrate together to a phenolphthalein end point (OH-¯→ H¸O; CO,²-→ HCO,¯). A mixture of either NaOH and Na,CO, or of Na,CO, and NaHCO, is titrated with HCI. The phenolphthalein end point occurs at 15.0 mL and the modified methyl orange end point occurs at 50.0 mL (35.0 mL beyond the first end point). The HCI was standardized by titrating 0.477 g Na,CO,, requiring 30.0 mL to reach the modified methyl orange end point. What mixture is present and how many millimoles of each constituent are present?

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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Question

Sodium carbonate can coexist with either NaOH or NAHCO, but not with both simultaneously,
since they would react to form Na,CO,. Sodium hydroxide and Na,CO, will titrate together to a
phenolphthalein end point (OH-→ H,0; CO,²→ HCO,-). A mixture of either NaOH and
Na,CO, or of Na,CO, and NaHCO, is titrated with HCI. The phenolphthalein end point occurs
at 15.0 mL and the modified methyl orange end point occurs at 50.0 mL (35.0 mL beyond the
first end point). The HCl was standardized by titrating 0.477 g Na,CO,, requiring 30.0 mL to
reach the modified methyl orange end point. What mixture is present and how many millimoles
of cach constituent are present?

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