In the beginning if we take a certain amount of water which is at room temp. the dissolving of salt in water will will be dependent on the molecular space between the molecules of water. If keep adding salt further after a certain the salt will stop dissolving in water due to lack of molecular space . Here we can do two things to continue dissolving of water 1) we can add more water which would provide more molecular space 2) we can increase its temp. which will increase molecular space In this way volume of water and temp. affect reaction between salt and water
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