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)?
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Sign up to join this communityHot 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)?
There seems to be two parts to your question. First, not all substances have increased solubility as water temperature rises. Gasses for example have decreased solubility in this case.
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.