A graduate student is preparing a solution in the laboratory. She mixes 10^-4 mole NaHCO3 (s) and 10-4 mole Na2CO3 (s) into water for a total solution volume of 1 L. Assume that the solid NaHCO3 and Na2CO3 dissolve completely, and that the solution is not open to the atmosphere. In this system, the following equilibrium reactions are relevant:
H2CO3 â H^+ + HCO3-1 pKa = 6.3
HCO3-1 <--> H^+ + CO3^2- pKa = 10.3
H2O <--> H+ + OH^- pKw = 14
Required:
a. What is the concentration of Na+ added to this system?
b. What is the total concentration of carbonate species added to the water?
c. The added concentrations of the carbonate species (H2CO3, HCO3^- , and CO3^2- ) used in part b are not the final equilibrium concentrations of these species. Write a mass balance equation on the three carbonate-containing species at equilibrium.
d. Write the 3 equilibrium expressions relevant to this system (i. e., K=activity of the products/activity of the reactants).
Answers: 3
Chemistry, 22.06.2019 08:00
Match the mixture with the substance// i really need on this guys (it’s a pic btw)
Answers: 1
Chemistry, 22.06.2019 08:30
The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.
Answers: 1
A graduate student is preparing a solution in the laboratory. She mixes 10^-4 mole NaHCO3 (s) and 10...
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