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Indicate which aqueous solution has the lowest vapor pressure. a. 0.1 M KCl d. 0.1 M...

Indicate which aqueous solution has the lowest vapor pressure.
a. 0.1 M KCl d. 0.1 M MgCl2
b. 0.1 M Na2CO3. e. 0.2 M MgCl2
c. 0.2 M NaCl

Please explain why!!
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Homework Answers

Answer #1

The vapor pressure of an ionic solution depends on the number of ions produced.The greater the number of ions, the larger the impact on colligative properties and the lower the vapor pressure.

Among the given solutions, KCl dissolves to produce 2 ions K+ and Cl-. Na2CO3 dissolves to form 2 Na+ and 1 CO32- ions. NaCl dissolves to produce Na+ and Cl- ions. MgCl2 dissolves to produce 1 Mg2+ and 2 Cl- ions. Therefore, in 0.2M MgCl2 solution, the number of ions is the most. For this reason, 0.2 M MgCl2 has the lowest vapor pressure.

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