Why does sugar or salt dissolve faster in hot water than cold water?

Question

I just want an explanation

Answer 1

If you think about a grain of table salt, you have many NaCl molecules all bound together. In order for salt to dissolve, all the molecules must be separated from each other, and then the individual ions that compose NaCl must be broken apart. In order to pull the ions (Na+ and Cl-) away from each other, water molecules must surround each ion. When temperature increases, the movement of particles also increases. As water's temperature goes up, the particles have more energy and there is a greater probability that it will hit a salt molecule and solvate the ion.

Answer 2

CHO -CHO2 is not Sugar----COH 4 is not acid(carbon has 5 valencies here instead of 4) . Solubility means,the sloute(Sugar or salt) becoming homogenous with the solvent(H2O).When the temperature increases the internal energy of the whole system increases and thevelocity of solvent and solute molucules also increases and the probability of collision between the molecules of solvent and solute molecules increases,linearly with the rise in temperature(within limits- that is till the chemicals do not get dis-integrated) and they become quickly homogenous-so "Solubility" increases with the rise in temperature.

Answer 3

Coz Hot is more unpleasant than Cold. The reason boils down to the molecular level too.

Lets take a sugar CHOCHO2 and salt COH4


CHOCHO2 + COH4 + 2H2O ----(thermodynamic reaction)--->

3CHO+H2+O2

This is a clear proof that the latent heat has no part in the heat reaction, however, heat did pace up the dissolution.

Answer 4

that due to the rate of reaction...when the temperature of the water is high(hot)..the particle in the water move faster..and more particle have Ea(minimum energy for the reaction take place)...so the collision frequency and effective frequency will increse..this will increase the rate of reaction...
the particles collide with each other more..so it dissolve faster

Answer 5

i think its because the hot water molecules are moving faster- farther apart- than cold water -slow moving - molecules. the sugar has more space to dissolve into the spaces between the molecules in hot water than cold.

Answer 6

Yep--I loved science classes, especially the labs--I think I was the only girl who DIDN'T mind dissecting the earthworms and frogs! Gimme' that scalpel!