Which of the following household items commonly contains acids?

• A. Sugar
• B. Table salt
• C. Vinegar
• D. Baking soda

Answer: (C)

Verified step by step guidance

1. Understand what an acid is: In chemistry, an acid is a substance that can donate a proton (H\textsuperscript{+}) or accept an electron pair. Household acids often have a sour taste and can react with bases to form salts and water.
2. Examine each household item: Sugar (sucrose) is a carbohydrate and is neutral, not acidic. Table salt (sodium chloride) is a neutral ionic compound formed from a strong acid and a strong base, so it is not acidic.
3. Consider vinegar: Vinegar contains acetic acid (CH\_3COOH), which is a weak acid commonly found in many households. This makes vinegar acidic.
4. Look at baking soda: Baking soda is sodium bicarbonate (NaHCO\_3), which is a basic compound, not an acid. It is often used to neutralize acids.
5. Conclude that among the options, vinegar is the household item that commonly contains acids due to its acetic acid content.