Question 10
To purify an impure salt sample (e.g. table salt or Epsom salt), approximately 50 g of the sample is mixed with 100 ml of distilled water and stirred. The solution is heated gently to near boiling, without boiling, then allowed to cool slowly at room temperature. The collected crystals are rinsed with a small amount of cold distilled water. Why is it necessary to rinse the purified salt crystals with cold distilled water?
