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if a single 5 g black of NaCl is placed in water, it dissolves slowly, but...

if a single 5 g black of NaCl is placed in water, it dissolves slowly, but if 5 g powered NaCl is placed in water, it dissolves rapidly. Explain.

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Answer #1

Black salt is the the rock form of the salta and contain some impurities of etc. Hence the presence of these impurities, the dissolved rate is decreased where as the powdered form of NaCl can form ion in water . the chemical reaction is

When NaCl dissolved in water , the Na+ attracted towards O- atom and the Cl- is attracted towards H+ atom of water molecule.

Hence a hydration shell is formed which prevent the formation of ionic bond between Na+ andCl-.

This reaction run rapidly.

The figure is given below

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