Multiple choice Why is common salt added to soap during its production? To decrease the solubility of the soap To increase the solubility of the soap To produce leather with hard water To provide greater cleaning action Reveal answer Fill a bubble to check yourself A Correct answer Explanation Common salt (sodium chloride) is added during soap manufacturing to reduce the solubility of soap in water, a process known as salting out. This causes the soap to precipitate and separate cleanly from the aqueous solution.