CHEM123 Lecture 3: T_week 3

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plumfrog577

30 Apr 2014

School

University of Waterloo

Department

Chemistry

Course

CHEM123

Professor

Christine Dupont

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Document Summary

The ph of water is 7. 00 at 25oc and 6. 13 at 100oc. These data indicate that, in water, the acidity of water increases as temperature increases. [h3o+] increases as temperature increases both the acidity and [h3o+] increase as temperature increases the acidity decreases as temperature increases. Consider the following acids and the statements that follow. Acrylic acid and 2-nitrophenol are both strong acids. 2-nitrophenol is a stronger acid than acrylic acid. The ph of a 0. 010 mol l 1 acrylic acid solution is greater than 2. The ph of a dilute solution of hbr is 6. 98 at 25 oc. (assume that hbr is 100% ionized. ) Kw = 1. 0 10 14 ph + poh = 14. 00. With the assumption that hbr is 100% ionized in aqueous solution, what is the ph of. The conjugate base of a weak acid is .

Related Questions

- Which of the following properly describes a colligative property of a solution?
A) a solution property that depends on the identity of the solute particles present
B) a solution property that depends on the electrical charges of the solute particles present
C) a solution property that depends on the amount of solute particles present
D) a solution property that depends on the pressure of the solute particles present
E) a solution property that depends on the amount, identity, and pressure of the solute particles present

- Which statement best explains the meaning of the phrase "like dissolves like"?
A. The only true solutions are formed when water dissolves a polar solute.
B. The only true solutions are formed when water dissolves a non-polar solute.
C. A solvent and solute with similar intermolecular forces will readily form a solution. D. A solvent will easily dissolve a solute of similar mass.

E. None of these statements is correct.

- The solubility of gases in liquids
A. increases as temperature increases and decreases as pressure increases

B. increases as temperature increases and increases as pressure increases

C. is independent of temperature and increases as pressure increases
D. decreases as temperature increases and increases as pressure increases

E. decreases as temperature increases and decreases as pressure increases

Which of the following statements is false?

The viscosity of a liquid decreases as temperature increases.

The vapor pressure of a substance increases as temperature increases.

The vapor pressure of a substance with strong intermolecular forces is greater than that of a substance with weak intermolecular forces (at the same temperature).

A substance boils when its vapor pressure is equal to the atmospheric pressure.

The boiling point of water increases as atmospheric pressure increases.

The half-life for a reaction that is first-order in A is 15 minutes. How long will it take for the concentration of A to change from 0.16 M to 0.040 M?

A(g) â B(g) + C(g)

		60 min
		45 min
		30 min
		23 min
		15 min

CHEM123 Lecture 3: T_week 3

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