Testing purity of aspirin

What is the chemical name for aspirin?

• Acetylsalicylic acid
• Acetaminophen
• Salicylic acid
• Ibuprofen

Which reagent is commonly used to test for the purity of aspirin?

• Iodine solution
• Ferric chloride solution
• Benedict's solution
• Silver nitrate solution

What colour change indicates the presence of impurities in aspirin when using ferric chloride?

• Blue
• Green
• Purple
• Yellow

What is the melting point range of pure aspirin?

• 120-130°C
• 160-165°C
• 135-140°C
• 140-145°C

Which method is commonly used to determine the melting point of aspirin?

• Recrystallisation
• Distillation
• Chromatography
• Melting point apparatus

What impurity is commonly found in aspirin due to hydrolysis?

• Benzoic acid
• Acetic acid
• Salicylic acid
• Citric acid

What is the first step in testing the purity of aspirin?

• Titration
• Melting point determination
• Dissolving in ethanol
• Filtering

Which solvent is aspirin usually soluble in?

• Water
• Ethanol
• Benzene
• Acetone

What is the purpose of recrystallisation in the purification of aspirin?

• To increase yield
• To remove impurities
• To change colour
• To determine melting point

Which instrument is used to measure melting points accurately?

• Thermometer
• Barometer
• Melting point apparatus
• Calorimeter