Question 11
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 purified salt crystals are transferred onto clean filter paper and allowed to air dry. Why is it important to dry the purified salt crystals before storage?
