Hydrogen ion

Okay kiddo, let's talk about hydrogen ions.

You know that everything is made up of tiny little things called atoms. Hydrogen is an atom that is pretty important because it's found in lots of things, including water.

When a hydrogen atom loses its electron, it becomes a hydrogen ion. That means it has a positive charge because it lost a negatively charged electron.

Now, if you mix water with some acid, like lemon juice, the acid can break apart and release some hydrogen ions. These hydrogen ions will stick to the water molecules and change the pH of the water to make it more acidic.

But don't worry, we have a way to measure this acidity using something called the pH scale. The pH scale goes from 0 to 14, with 7 being neutral (like pure water). The lower the number on the scale, the more acidic the substance is.

So, to wrap it up, a hydrogen ion is a tiny little particle with a positive charge that can change the acidity of things when it mixes with them.