# q4ps11 - -8 M Sr(OH 2 d 5x10-7 M HCl 5 Consider the diagram...

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CH302 Practice Quiz 4 TA Style 1. What is the molar solubility of Be(OH) 2 in a solution with a pOH of 2? The Ksp of Be(OH) 2 is 7x10 -22 . a. 7x10 -24 b. 7x10 -18 c. 7x10 -20 d. 7x10 -22 2. Which of the following cations would be hardest to separate by addition of OH - ? Be(OH) 2 K sp = 7x10 -20 Co(OH) 2 K sp = 6x10 -15 Ca(OH) 2 K sp = 5x10 -6 Mg(OH) 2 K sp = 5.6x10 -12 3. Write the correct charge balance for an aqueous solution of BaSO 4 and NaClO 2 . a. [Ba 2+ ] + [Na + ] + [H + ] = [OH - ] + [SO 4 2- ] + [HSO 4 - ] + [ClO 2 - ] b. 2[Ba 2+ ] + [Na + ] + [H + ] = [OH - ] + 2[SO 4 2- ] + [ClO 2 - ] c. [Ba 2+ ] + [Na + ] = [SO 4 2- ] + [HSO 4 - ] + [ClO 2 - ] d. 2[Ba 2+ ] + [Na + ] = 2[SO42-] + [HSO 4 - ] + [ClO 2 - ] e. 2[Ba 2+ ] + [Na + ] + [H + ] = [OH - ] + 2[SO 4 2- ] + [HSO 4 - ] + [ClO 2 - ] 4. Which of the following solutions would most likely have a pH very close to 7?

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Unformatted text preview: -8 M Sr(OH) 2 d. 5x10-7 M HCl 5. Consider the diagram below: At approximately what pH(s) do(es) the zwitterion represent about 25% of the total species in solution? a. 2 b. 6 c. 10 d. 2 and 10 6. The K a of HSO 4-is 1.2x10-2 . For which of the solutions below would [SO 4 2-] be closest to K a ? a. .01 M H 2 SO 4 b. .1 M H 2 SO 4 c. 1 M H 2 SO 4 d. 10 M H 2 SO 4 7. For which of the solutions below does solving the pH NOT require knowledge of the concentration(s) of the specie(s) in solution? a. 0.45 mM H 3 AsO 4 b. 0.9 M Na 2 CO 3 c. 3.3333 M KHSO 3 d. 2 M NH 3 8. A weak polyprotic acid, H 3 A has pK a s of 3, 7 and 11. If you dissolved 1 mole of Na 3 A in 2,500 mL of water, what would be the resulting pOH? a. 3.7 b. 1.7 c. 9 d. 5 e. 5.7...
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