Web_Quiz_3_Solutions

Web_Quiz_3_Solutions - Web Quiz 3 with answer

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1 1. At 0°C, the ion-product constant of water, K w , is 1.2 x 10 -15 . The pH of pure water at 0°C is: (use 3 sig figs) 2. The equilibrium constants ( K a ) for HCN and HF in H 2 O at 25°C are 6.2 x 10 -10 and 7.2 x 10 -4 , respectively. The relative decreasing order of base strengths is: A. F - > H 2 O > CN - B. H 2 O > F - > CN - C. CN - > F - > H 2 O D. F - > CN - > H 2 O E. none of these
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2 3. Which of the following is not true for a solution at 25°C that has a hydroxide concentration of 2.5 x 10 -6 M? A. K w = 1 x 10 -14 B. The solution is acidic. C. The solution is basic. D. The [H] is 4 x 10 -9 M. E. The K w is independent of what the solution contains. 4. Which of the following reactions does not proceed far to the right in aqueous solutions? A. HCl + H 2 O H 3 O + + Cl - B. H 3 O + + OH - 2H 2 O C. H 2 O + HSO 4 - H 2 SO 4 + OH - D. HCN + OH - H 2 O + CN - E. H 2 SO 4 + H 2 O H 3 O + + HSO 4 -
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5. Which of the species below, when dissolved in H 2 O, will not produce a basic solution? A.
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Web_Quiz_3_Solutions - Web Quiz 3 with answer

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