The rate of dissolution is strongly dependent on other factors besides temperature. These additional factors include the amount of salt, the volume of water, the ionic strength of the solution, and the stirring/agitation of the solution. Thus, it is impossible to give a general answer.
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It varies depending on several factors such as surface area, temperature, the amount of solute already dissolved in the water, and stirring.
in hot water salt would dissolve very quickly, not sure about the exact time. however for cold water it will not dissolve as fast as hot water.
There is no exact answer. It depends on the water to salt ratio and a bunch of other factors. Stirring helps speed it up though.
Salt dissolve quicker in hot water because it practicaly melts the salt there fore making it quicker.
Sugar sinks at the same rate in warm or cold water. Sugar dissolves faster in warm water.
the hottter the temperature the faster salt dissolves
Yes. Rock salt, which is largely the same as table salt, will dissolve in water.
A1 Because water is a solvent, and as long as the material, in this case salt, has less density than the liquid itself, it should sink. But, other solutes like sugar, are denser and water, and will simply sink. A2 Strictly, there are many many salts, and common table salt, NaCl is the one we meet most commonly. This dissolves readily in water as you remark. Copper Sulphate 'bluestone' is another salt. Some salts are essentially insoluble, such as many of the Mercury salts - especially the Mercurous ones.