measure the conductivity, pure water is just h2o, which is good insulator. with the present of sodium, it can carry electron and we can measure the current pass through.
This measure is the concentration of NaCl expressed in mol/L, g/L, g/100 g (percentage).
pH is a measure of the acidity. concentration of salts would be molarity.
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Salts may be soluble or insoluble in water.
Only soluble salts are dissociated in water.
Soluble salts are dissociated in water.
Insoluble salts doesn't diffuse in water.
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Polar salts are easily dissolved in water.
Evaporating the water crystallized salts are obtained.
Many salts are soluble in water.