Crushed salt bec. it is alot smaller/tiny than the uncrushed ones........
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Crushed salts because the rate or the chemical kinetics for a reaction to proceed (e.g for solubility, dissolving solids in an aqueous solution) depends on the particle size. The tinier the the substance (powdered form), the more it dissolves faster, hence the crushed salts dissolves faster than the uncrushed salts.
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