The coagulation of 100 mL of a colloidal solution of gold is completely prevented by the addition of 0.25 g of starch to it before adding 1 mL of 10% NaCl solution . Calculate the gold number of starch.

0.63 g of HNO_(3) dissolved in 100 ml of solution. Calculate its pH value.

On adding one mL of solution of 10% NaCl to 100 mL of gold sol in the presence of 0.25 g of starch, the coagulation is Just prevented. The gold number of starch is

50 mL of standard gold sol. needs 0.05 mg of gelatin for its protection from coagulation. Calculate gold number of gelatin.

A solution of NaOH is made by dissolving of 0.9 g of it in 100 ml of its solutoin. Calculate the molarity of the solution.

If 100 ml of 1N H2SO4 is mixed with 200 ml of 1N HCl solution . calculate the normality of resulting solution .

A solution is prepared by dissolving 1.0 g of NaOH in water to get 250 ml of solution . Calculate its molarity .

A solution is prepared by dissolving 18.25g of NaOH in distilled water to give 200ml of solution. calculate the molarity of solution.

the protective power of the lyophilic colloids is expressed in terms of gold number, a term introduced by Zsigmondy. Gold number is the number of milli - gram of the protective colloid which prevent the coagulation of 10 mLof red gold sol , when 1 mL of a 10 per cent solution of sodium chloride is added to it . thus smaller the gold number of lyophillic colloid, the greater is the protective power. On addition of one mL of sloution of 10 % NaCl to 10 mL. of red gold sol in presence of 0.025 g of starch the coagultion is just prevented . the gold number of starch is : 0.025, 0.25, 2.5, 25.

100 mL of a solution containing 5 g of NaOH are mixed with 200 mL of M/5 NaOH solution. Calculate the molarity of the resulting solution.

On addition of 1 mL solution of 10% NaCl to 10 mL gold sol in the presence of 0.0250 g of starch, the coagulation is just prevented. Starch has the gold number :