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Lecture 9.4.09 - Friday September 4 W h ic h o f t h e f o...

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Friday, September 4 CHEM 1251, Fall 2009 1 Which of the following best describes the “before” and “after” states of solid MgCl 2 dissolving in water? a. Solid MgCl 2 contains no charged species, but after it’s dissolved the solution contains Mg 2+ ions and dissolved Cl 2 gas. b. Solid MgCl 2 contains no charged species, but after it’s dissolved the solution contains Mg 2+ and Cl - ions. c. Solid MgCl 2 and MgCl 2 solution both contain Mg 2+ and Cl - ions. d. Solid MgCl 2 and MgCl 2 solution both contain Mg 2+ and Cl 2 - ions e. Solid MgCl 2 contains ions, but after it dissolves it forms neutral MgCl 2 molecules hydrated by polar water molecules. 2 Figure 4.2 3 Suppose this represents the hydrochloric acid ( H Cl) solution: Based on the conductivity tests, which of the following might best represent the acetic acid (CH 3 COO H ) solution? Cl - H + H + H + Cl - Cl - H + H + CH 3 COO - CH 3 COO - CH 3 COO H CH 3 COO H CH 3 COO H CH 3 COO H CH 3 COO H CH 3 COO - H + A B C 4 PhET Salts and Solubility Sim http: //phet . colorado .
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