Which of the following substances is primarily responsible for soap's slippery texture?

• A. carbonate
• B. an acid
• C. water
• D. a base

Answer: (D)

Verified step by step guidance

1. Understand that soap's slippery texture is due to its chemical nature, which is related to its pH and molecular structure.
2. Recall that soap is typically made by the saponification process, which involves the reaction of a fat or oil with a strong base, such as sodium hydroxide (NaOH).
3. Recognize that the resulting soap molecules have a hydrophilic (water-attracting) end that is negatively charged, which interacts with water and gives a slippery feel.
4. Identify that the slippery texture is primarily due to the basic nature of soap, as bases tend to feel slippery because they react with the oils on your skin to form a slippery film.
5. Conclude that among the options given, a base is responsible for soap's slippery texture, not carbonate, an acid, or water.