Pharmaceutical Analysis Quiz

Which of the following is a major reason for using non-aqueous titrations in pharmaceutical analysis?

• Poor solubility of compounds in water

• High reactivity of compounds in water

• Easy determination of all organic compounds

• Non-reactivity of acids in water

What is the main advantage of non-aqueous titrations?

• Increased solubility of substances

• Decreased selectivity in analysis

• Reduced reaction speed

• Higher water content in titrations

Which of the following solvents is considered protophillic?

• Sulfuric acid

• Acetic acid

• Water

• Dimethylformamide

What type of solvent is glacial acetic acid?

• Protophillic

• Protogenic

• Amphiprotic

• Non-polar

What is the purpose of adding acetic anhydride in the preparation of 0.1N perchloric acid solution?

• To increase the acidity of the solution

• To remove water and make the solution anhydrous

• To neutralize the perchloric acid

• To act as a solvent

Which indicator is commonly used in non-aqueous titrations involving perchloric acid?

• Phenolphthalein

• Methyl orange

• Crystal violet

• Bromothymol blue

In non-aqueous titrations, potassium hydrogen phthalate is used to standardize:

• Sodium hydroxide solution

• Hydrochloric acid solution

• Perchloric acid solution

• Sulfuric acid solution

What is the effect of temperature on non-aqueous titrations?

• It has no effect on titration results

• It increases the titration accuracy

• It causes expansion of solvents, leading to errors

• It enhances the solubility of all analytes

Which of the following acids exhibits the highest acidity in non-aqueous solvents?

• Hydrochloric acid

• Sulfuric acid

• Perchloric acid

• Nitric acid

What does the term "redox" stand for?

• Reduction and oxidation

• Reduction and neutralization

• Oxidation and precipitation

• Oxidation and hydrolysis