Reaction Order and Rate Laws

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1.
What is the pH of a buffer that results when 33 g NaHCO3 is mixed with 100.0 mL of 2.50 M NaOH and diluted with water to 250 mL? (Ka for HCO3- = 4.8  10-11)
(Points : 10) 8.20 10.07 10.12 10.32 10.56

2.
What is the pH of an aqueous solution of 0.30 M HF and 0.15 M F-? (Ka of HF = 7.2  10-4)
(Points : 10) 1.83 2.84 3.14 3.44 10.86

3.
Which of the following mathematical expressions is the Henderson-Hasselbalch equation?
(Points : 10) pKa = pH + log pH = pKa + log pH = pKa + log pKa = pH - log pH = pKa + log

4.
The Ksp of CaSO4 is 4.9  10-5 at 25 C. What is the concentration of Ca2+ in a saturated solution of CaSO4?
(Points : 10) 2.4  10-9 M 2.5  10-5 M 4.9  10-5 M 7.0  10-3 M 3.7  10-2 M

5.
What is the pH of the buffer that results when 12.5 g of NaH2PO4 and 22.0 g Na2HPO4 are mixed and diluted with water to 0.500 L? (The acid dissociation constants for phosphoric acid are Ka1 = 7.5  10-3, Ka2 = 6.2  10-8, and Ka3 = 3.6  10-13)
(Points : 10) 2.30 7.04 7.38 12.27 12.62

6.
Which of the following combinations would be the best to buffer an aqueous solution at a pH of 5.0?
(Points : 10) H3PO4 and H2PO4-, Ka1 = 7.5  10-3 HNO2 and NO2-, Ka = 4.5  10-4 CH3CO2H and CH3COO-, Ka = 1.8  10-5 H2PO4- and HPO42-, Ka2 = 6.2  10-8 NH4+ and NH3, Ka = 5.7  10-10

7.
A 50.0 mL sample of vinegar is titrated with 0.774 M NaOH(aq). If the titration requires 41.6 mL of NaOH(aq), what is the concentration of acetic acid in the vinegar?
(Points : 10) 0.0921 M 0.429 M 0.644 M 0.930 M 0.967 M

8.
Which of the following equations is the solubility product for magnesium iodate, Mg(IO3)2?
(Points : 10) Ksp =