Ca2+ in a drinking water sample was analyzed by the following reactions below:Ca2+(aq) + C2O42-(aq) → CaC2O4 (s) → CaO(s) + CO(g)+ CO2(g)First an excess of C2O42- was added to 0.10 L of the Ca2+ water sample.Then CaC2O4 was precipitated, which was demcomposed into CaO with filtering and some heat.The CaO was measured to be 5.61 mg.What is the concentration of Ca2+ in the original water sample? The MW of CaO is 56.1 g/mol. 0.0100M 0.0010 M 1.00 M 0.100 M The partition coefficient (K) of methylamine (CH3NH2) is 4.50, preferring the organic layer over the aqueous layer in this extraction. The Ka of methylammonium (CH3NH3+) is 2.00 x 10-11. If 10 mL aqueous methylamine solution at pH 11.0 is extracted with 20.0 mL organic solvent, what is the fraction of solute remaining in the water (q)? HINT: methylamine is a weak base. 14.3% 10.0% 18.2% 81.8%

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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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Ca²⁺ in a drinking water sample was analyzed by the following reactions below:

Ca²⁺(aq) + C₂O₄^2-(aq) → CaC₂O₄ (s) → CaO(s) + CO(g)+ CO₂(g)

First an excess of C₂O₄^2- was added to 0.10 L of the Ca²⁺ water sample.
Then CaC₂O₄ was precipitated, which was demcomposed into CaO with filtering and some heat.
The CaO was measured to be 5.61 mg.

What is the concentration of Ca²⁺ in the original water sample? The MW of CaO is 56.1 g/mol.

		0.0100M
		0.0010 M
		1.00 M
		0.100 M

The partition coefficient (K) of methylamine (CH₃NH₂) is 4.50, preferring the organic layer over the aqueous layer in this extraction. The K_a of methylammonium (CH₃NH₃⁺) is 2.00 x 10^-11. If 10 mL aqueous methylamine solution at pH 11.0 is extracted with 20.0 mL organic solvent, what is the fraction of solute remaining in the water (q)?

HINT: methylamine is a weak base.

		14.3%
		10.0%
		18.2%
		81.8%

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