Assay of Zinc Oxide

Question 1

Dissolve about ___________, accurately weighed, and 2.5 g of ammonium chloride in 50.0 ml of 1 N sulfuric acid VS with the aid of gentle heat, if necessary. When the solution in complete, add methyl orange TS, and titrate the excess sulfuric acid with 1 N sodium hydroxide VS. Each mL of 1 N sulfuric acid is equivalent to 40.69 mg of ZnO

Answer 1

1.5 g of freshly ignited Zinc Oxide

Question 2

Dissolve about 1.5 g of freshly ignited Zinc oxide, accurately weighed, and_______ in 50.0 ml of 1 N sulfuric acid VS with the aid of gentle heat, if necessary. When the solution in complete, add methyl orange TS, and titrate the excess sulfuric acid with 1 N sodium hydroxide VS. Each mL of 1 N sulfuric acid is equivalent to 40.69 mg of ZnO

Answer 2

2.5 g of ammonium chloride

Question 3

Dissolve about 1.5 g of freshly ignited Zinc oxide, accurately weighed, and 2.5 g of ammonium chloride in _______ with the aid of gentle heat, if necessary. When the solution in complete, add methyl orange TS, and titrate the excess sulfuric acid with 1 N sodium hydroxide VS. Each mL of 1 N sulfuric acid is equivalent to 40.69 mg of ZnO

Answer 3

50.0 ml of 1 N sulfuric acid VS

Question 4

Dissolve about 1.5 g of freshly ignited Zinc oxide, accurately weighed, and 2.5 g of ammonium chloride in 50.0 ml of 1 N sulfuric acid VS with the aid of gentle heat, if necessary. When the solution in complete, add _______, and titrate the excess sulfuric acid with 1 N sodium hydroxide VS. Each mL of 1 N sulfuric acid is equivalent to 40.69 mg of ZnO

Answer 4

methyl orange TS

Question 5

Dissolve about 1.5 g of freshly ignited Zinc oxide, accurately weighed, and 2.5 g of ammonium chloride in 50.0 ml of 1 N sulfuric acid VS with the aid of gentle heat, if necessary. When the solution in complete, add methyl orange TS, and titrate the excess sulfuric acid with _________. Each mL of 1 N sulfuric acid is equivalent to 40.69 mg of ZnO

Answer 5

1 N sodium hydroxide VS

Question 6

Dissolve about 1.5 g of freshly ignited Zinc oxide, accurately weighed, and 2.5 g of ammonium chloride in 50.0 ml of 1 N sulfuric acid VS with the aid of gentle heat, if necessary. When the solution in complete, add methyl orange TS, and titrate the excess sulfuric acid with 1 N sodium hydroxide VS. Each mL of 1 N sulfuric acid is equivalent to ____ of ZnO

Answer 6

40.69 mg

Question 7

Zinc oxide: type of chemical reaction

Answer 7

Neutralization reaction, acidimetry

Question 8

Zinc oxide: Type of titration

Answer 8

Residual titration

Question 9

Zinc oxide: indicator

Answer 9

Methyl orange TS

Question 10

Zinc oxide: Endpoint

Question 11

Zinc oxide: Official Requirement

Answer 11

Zinc Oxide, freshly ignited, contains not less than 99.0 percent and not more than 100.5 percent of ZnO.