Multiple choice

Which of the following substances is used by milk vendors to prevent curdling in hot climates?

  1. Sodium carbonate

  2. Sodium hydroxide

  3. Calcium carbonate

  4. Sodium hydrogen carbonate

  5. Lactic acid

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium hydrogen carbonate, commonly known as baking soda, is added to the milk. This in turn, neutralises lactic acid and the milk does not curdle.