Solutions and Mixtures

AP Chemistry· difficulty 3/5

Adding salt to water _______ its boiling point because

A
$raises; ions disrupt vapor pressure equilibrium, requiring higher T to boil$
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B
$doesn't change$
C
$lowers; salts evaporate$
D
$lowers; less heat is needed to boil$

Explanation

Solute lowers vapor pressure \to must heat to higher T for vapor pressure to reach 1 atm. ΔT_b = K_b \cdot m \cdot i.

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