These are particles that carry a strong positive charge. Bases are just the opposite. They have negatively charged ions called hydroxyl ions. Soap, eggs, and most detergents are common bases. The pH scale, which goes from 0-14, is used to compare acids and bases.
Acids have low pH numbers, while bases are high on the scale.
And tomorrow, we'll show you how it works. Thursday Cabbage juice is a good indicator solution - that is, you can use it to test whether another substance is an acid or a base. You don't need a lot of fancy lab equipment - just a pot or saucepan filled with a quart of water, a red cabbage, a clear container like a glass measuring cup, and a lemon. Pour some of the cabbage water into the container, and add some cold tap water to cool it off. Now, cut the lemon and add the juice a drop at a time.