# Predicting the solution with the highest boiling point

I am facing problem with the following question:

Predict which solution will have the highest boiling point in increasing order?

1. $$1~\%$$ solution of $$\ce{C6H12O6}$$

2. $$1~\%$$ solution of $$\ce{NaCl}$$

3. $$1~\%$$ solution of $$\ce{ZnSO4}$$

4. $$1~\%$$ solution of $$\ce{(NH2)2CO}$$

I know that more is the van ’t Hoff factor more will be the elevation in boiling point and hence the solution will have more boiling point. Hence 1. should have the lowest boiling point followed by 4. But I am not sure about options 2. and 3.

• What do colligative properties depend on? Commented Oct 6, 2016 at 23:18
• @getafix It depends only on the number of solute particles and not on the nature of solute particles
– Pink
Commented Oct 6, 2016 at 23:26
• You were right that you need to look at the Van 't Hoff factors. Think about which of 2. or 3. is more soluble in water. Also, between 1. and 4., think about whether any association of molecules can occur via H-bonding and how would that affect the Van t' Hoff factor.
Commented Oct 6, 2016 at 23:45
• I don't think the solubility is the most important factor here. The most important question to ask is what the question means by 1%? I assume this is a mass-to-mass percentage... From there you can apply what you know about colligative properties.
– Zhe
Commented Oct 7, 2016 at 1:13
• @Zhe yes it I'd mass to mass percentage.but how it could affect if it were some other percentage.
– Pink
Commented Oct 7, 2016 at 1:17