Why is distilled water commonly used in laboratory experiments?

• A. It is less expensive than tap water and therefore preferred.
• B. It contains extra minerals that help reactions proceed faster.
• C. It is more acidic than tap water, which is required for most experiments.
• D. It does not contain impurities that could interfere with experimental results.

Answer: (D)

Verified step by step guidance

1. Understand that distilled water is water that has been purified by boiling it into vapor and then condensing it back into liquid, removing most impurities and dissolved substances.
2. Recognize that impurities in water, such as minerals, ions, or organic matter, can interfere with chemical reactions or measurements in laboratory experiments by introducing unwanted variables.
3. Note that tap water often contains dissolved minerals and other contaminants that can affect the accuracy and reproducibility of experimental results.
4. Realize that distilled water, being free from these impurities, provides a consistent and controlled medium for experiments, ensuring that observed effects are due to the intended reactants only.
5. Conclude that distilled water is preferred in laboratories not because of cost, acidity, or added minerals, but because it minimizes interference and helps maintain the integrity of experimental data.