Potassium hydrogen phthalate is commonly known as which of the following acids?

• A. KHP
• B. Sulfuric acid
• C. Hydrochloric acid
• D. Acetic acid

Answer: (A)

Verified step by step guidance

1. Identify the full name of the compound: Potassium hydrogen phthalate (KHP) is a specific chemical compound used commonly in acid-base titrations as a primary standard.
2. Understand that KHP is not a common name for sulfuric acid, hydrochloric acid, or acetic acid, which are well-known strong or weak acids with different chemical formulas.
3. Recognize that KHP is a weak acid salt derived from phthalic acid and potassium, often used because it is stable, pure, and has a known molar mass.
4. Recall that sulfuric acid is H\_2SO\_4, hydrochloric acid is HCl, and acetic acid is CH\_3COOH, none of which correspond to potassium hydrogen phthalate.
5. Conclude that potassium hydrogen phthalate is commonly abbreviated as KHP and is distinct from the other acids listed.