A colloid is formed by adding FeCl, in excess of hot water. What will happen if excess sodium chloride is added to this colloid?
Positively charged ions coagulate the negatively charged sol and negatively charged fon coagulate the positively charged sol. Positively charged sol of hydrated ferric oxide is formed when FeCl, is added in excess of hot water. On adding excess of NaCl to this sol, negatively charged Cl” ions coagulate the positively chargedsol of hydrated ferric oxide.
