Question

Water for injection is prepared by using___distillation

• A. Fractional
• B. Molecular
• C. Simple
• D. Steam

Answer 1

The Correct Option is C

The question asks about the method used to prepare "Water for injection." Let's explore each option and explain why "Simple" distillation is the correct answer.

Understanding Water for Injection:
Water for injection is highly purified, sterile water used for preparing pharmaceutical drugs for injection. It must be free from any contaminants, pyrogens, and particulates.

1. Fractional Distillation: This method separates a mixture into its component parts or fractions, based on their boiling points. It is not typically used for water purification, especially for preparing injection-quality water.
2. Molecular Distillation: This is a type of short-path vacuum distillation, characterized by the distance between the evaporator and the condenser. It's used for heat-sensitive materials and is not suitable for water purification.
3. Simple Distillation (Correct Answer):
   Simple distillation involves boiling the water to produce steam, which is then condensed back into a liquid. This method removes contaminants and particulate matter, making it suitable for producing sterile water for injection.
4. Steam Distillation: This method is typically used to extract essential oils from plants and is not applicable for producing water for injection.

The key requirement for water used in injections is purity, free from non-volatile contaminants and microbial agents. Simple distillation provides the necessary level of purification by boiling, which separates the water from impurities.

Thus, the correct answer is Simple distillation.