# How much more salt can I dissolve in hot water compared to cold water?

Hot water increases not only the speed of solubility but also the amount.

I don't know whether this is for all materials in water, apart from salt.

But, if this is the case, what causes hot water to dissolve more salt (or other solutes)?

• Searching for 'salt solubility in different temperatures' in Google yields many results, among them this simple explanation and this table. I believe most basic chemistry books also cover this topic. – Don_S Jan 12 '17 at 14:30
• Your statement is not generally true. For NaCl, there is only a slight increase in solubility, can be much stronger for others, or even reversed. The reason is thermodynamics, of course, but would be nice if someone worked out when exactly what happens. – Karl Jan 13 '17 at 6:30

As for the second part of the question, increased heat adds energy to the water molecules which makes it easier to overcome the bonds between $\ce{Na}$ and $\ce{Cl}$. According to Wikipedia, the solubility of $\ce{NaCl}$ in nearly freezing water is $35.65 \, \mathrm{g} / 100 \, \mathrm{mL} \, \ce{H2O}$ versus boiling water which is $38.99 \,\mathrm{g} / 100 \, \mathrm{mL}\, \ce{H2O}$. Hope this helped.