Question
Which of the following solutes in aqueous solution would be expected to exhibit the smallest freezing-point lowering (assuming ideal behavior?
0.1 m NaCl
.2 m CH3COOH
.05 m Al2(SO4)3
.1 m MgCl2
.25 m NH3
What would be the steps to picking the right option? Because just picking .05 because it appears to be the smallest amount is likely wrong.
0.1 m NaCl
.2 m CH3COOH
.05 m Al2(SO4)3
.1 m MgCl2
.25 m NH3
What would be the steps to picking the right option? Because just picking .05 because it appears to be the smallest amount is likely wrong.
Answers
delta T = i*Kf*m
Since Kf is constant we can forget that. dT depends upon i and m so
i*m for each.
NaCl is 0.1*2 = ? for i = 2
CH3COOH is 0.2*1 for i = 1
Al2(SO4)3 is 0.05*5 for i = 5
MgCl2 i = 3
NH3 i = 1
The greatest i*m causes the greatest dT (or the smallest i*m causes the least dT).
Since Kf is constant we can forget that. dT depends upon i and m so
i*m for each.
NaCl is 0.1*2 = ? for i = 2
CH3COOH is 0.2*1 for i = 1
Al2(SO4)3 is 0.05*5 for i = 5
MgCl2 i = 3
NH3 i = 1
The greatest i*m causes the greatest dT (or the smallest i*m causes the least dT).
It’s nacl
0.1 m MgCl2
Related Questions
What is the expected freezing point of a 3.50 m aqueous solution of BaCl2 (Kfp=1.86C/m)? What is the...
Which of the following solutes in aqueous solution would be expected to exhibit the LARGEST freez...
Choose the aqueous solution below with the lowest freezing point. These are all solutions of nonvoli...
The freezing-point depression for a given aqueous solution is 0.32 K. The freezing-point depression...