Multiple choice

What 2 things occur when an eggshell is soaked in vinegar?

  1. it reacts with the acid

  2. it collects negative charges that bind to the dye

  3. it hardens

  4. it collects positive charges that bind to the dye

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

When an eggshell is soaked in vinegar, the acetic acid reacts with the calcium carbonate in the shell. Additionally, the acidic environment protonates the proteins in the eggshell, giving them a positive charge that allows them to bind to the acidic dye molecules.