State Le Chatelier's principle.

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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A.
State Le Chatelier's principle.
Consider the following equilibria:
H2(g) + CO(g);
Cr207 (ag) + H2O«
AH =+131 kJ mo-1
Equilibrium I: H2Og + Ce)
Equilibrium II: Cr2O4 (aq) + 2H¨(aq)
Use Le Chatelier's principle to predict and explain the effect of:
i. increasing the pressure on Equilibrium I.
ii. increasing the temperature on Equilibrium I.
iii. increasing [H+] on Equilibrium II.
iv. the presence of a catalyst on Equilibrium II.
A solution, A, is saturated with two sparingly soluble salts; calcium hydroxide
and calcium sulphate. The pH of the solution is 12.3.
С.
i. Define pH.
ii. Calculate the hydroxide ion concentration in mol dm.
iii. Write an expression for the solubility product, Kp of calcium hydroxide and state its
units.
iv. If the numerical value of the solubility of calcium hydroxide is 4.0 x 10° calculate the
concentration, in mol dm³, of calcium ions in solution A.
B.
Transcribed Image Text:A. State Le Chatelier's principle. Consider the following equilibria: H2(g) + CO(g); Cr207 (ag) + H2O« AH =+131 kJ mo-1 Equilibrium I: H2Og + Ce) Equilibrium II: Cr2O4 (aq) + 2H¨(aq) Use Le Chatelier's principle to predict and explain the effect of: i. increasing the pressure on Equilibrium I. ii. increasing the temperature on Equilibrium I. iii. increasing [H+] on Equilibrium II. iv. the presence of a catalyst on Equilibrium II. A solution, A, is saturated with two sparingly soluble salts; calcium hydroxide and calcium sulphate. The pH of the solution is 12.3. С. i. Define pH. ii. Calculate the hydroxide ion concentration in mol dm. iii. Write an expression for the solubility product, Kp of calcium hydroxide and state its units. iv. If the numerical value of the solubility of calcium hydroxide is 4.0 x 10° calculate the concentration, in mol dm³, of calcium ions in solution A. B.
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