During the concentration process of bauxite: Why is `AI(OH)_3` added in small quantity and diluted with water to sodium aluminate solution?

During the concentration process of bauxite: Why is hot concentrated NaOH used?

Aluminium is prepared industrially by Hall- Heroult process. Various steps in the concentration of ore are given below. Write them in the correct order. i)The precipitate formed is separated, washed and strongly heated to get alumina. ii) Crushed bauxite is leached with hot sodium hydroxide solution. iii) Impurities are removed from the sodium aluminate solution by filtration. iv) Solution is diluted after adding a little aluminium hydroxide, to precipitate aluminium hydroxide .

The major role of fluorspar (CaF_2) , which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na_3AIF_6) , is

When some sodium acetate is added to a solution of acetic acid, the concentration of unionised acetic acid increases. What happens to the value of solubility and solubility product when HCl is passed through an AgCl solution?

During the estimation of Mohr's: salt. by using potassium permanganate, on 'adding KMnO solution to acidified Mohr's salt solution, pink colour of permanganate vanishes and finally appears at the end point a. Give the chemistry of the reaction. b. Illustrate the oxidising property of '(KMnO)_(3)' in basic medium..

Sodium reacts with water. a. Identify the gas evolved in the reaction. b. If two drops of phenolphthalein is added to the water, what will be colour change of the resultant solution? Explain the reason.

Conductance of an electrolyte depends upon temperature of electrolyte and concentration of the electrolytes. What happens to the molar conductivity of an electrolyte solution when diluted with water? Justify your answer.