Match the following aqueous solutions with the appropriate letter from the column on the right.
How does the m reflect boiling point?
1. | 0.14 m | CrI2 | A. | Highest boiling point | ||
2. | 0.13 m | Na2CO3 | B. | Second highest boiling point | ||
3. | 0.15 m | ZnCl2 | C. | Third highest boiling point | ||
4. | 0.47 m | Ethylene glycol(nonelectrolyte) | D. | Lowest boiling point |
There will an increase in boiling point of water when
solute
is added to it.it is given by
dtb = i.Kb.m
Kb= constant for water, i= factor depends on number of
ions,m=molality
1. 0.14 m CrI2
here m= 0.14, i= 3 [3 ions forms]
dTb = 3*0.14 *Kb = 0.42 Kb
2. 0.13 m Na2CO3
m= 0.13, i= 3 [3 ions forms]
dTb= 0.13*3.Kb = 0.39 Kb
3. 0.15 m ZnCl2
m= 0.15 , i= 3
dTb = 0.45Kb
4. 0.47 m Ethylene glycol
m=0.47 , i=1 [it will ot ionize]
dTb = 0.47 Kb **
So highest dTb value means highest boling point . Hence
glycol
has highest BP
4.0.47m Ethylene glycol.. Highest boiling point
3.0.15 m ZnCl2...Second highest boiling point
1.0.14 m CrI2....Third highest boiling point
2. 0.13m Na2CO3.....Lowest boiling point
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