Why Does Salt Solubility Go Down As Temperature Increases? Please Help...Urgent

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Water can hold more salt when it is warmer. The effect is not so strong with salt as it is with sugar.

Look at it this way: When water is warmed up its molecules are vibrating around more. It is this vibration (brownian motion actually) that allows more salt molecules to stay in solution.

Just the opposite happends when water gets cooler: Its molecules are virbating less and the smaller salt molecules can fall to the bottom of the container or stick together to form crystals
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It is called saturation of a solution.
When you try to dissolve salt and keep pouring more salt in the water, you'll come to a point when the water can not hold more salt, at that point it'll be called Saturated Solution at that Specific temperature.

Water(or any liquid, we should use the term solvent) can hold more solute(salt) if the temperature is increased.
The science behind it is that we know that molecules in liquid have spaces between that made the salt to get in water, now when solution becomes saturated the space between the liquid is almost filled, when you'll increase the temperature the particles will get kinetic energy and their movement will create more space, so by that saturation will be lost and the solution can hold more solute now.

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