Chemistry! :]

So this week we did a lot of interesting labs involving bases and acids and trying to figure out the pH level of a certain solution. It was cool to see how ROY G. BIV applied to determining of what the pH was. Basically if the solution turned into any colors from red to yellow, it is an acid (pH 0-6). Colors green to purple meant the solution is basic (pH 8-14). Yellow usually is a neutral color, which means the pH level of that solution is 7. We also learned with litmus paper, if it was blue to red, its an acid, but if the color goes from red to blue, its a base-a-roo. ahhh! we have a test tomorrow!! The material is so confusing and i dont really understand the ionization stuff :[ I have to study tonight!!!