Is a solution with a pH 4 moderately acidic or extremely acidic?

Answer 1

Well, I'm gonna follow the "teach a man (or woman) to fish" theory on this one.

First, I'm going to give you the answer to your specific question. A pH of 3 is moderately acidic.

Now, to help you on your way here, I'm going to explain the basics of pH.

The pH scale goes from 1 to 14. There is a good reason why it doesn't go to 0, but I will get to that in a second.

Basically, what it actually translates to, is the concentration of H+ ions in a solution (an H+ ion is a hydrogen atom with no electron around it, so basically, it's a proton). However, the more confusing part is that as the numbers go up, the concentration of H+ ions goes down at an exponential rate (quite literally, in fact).

The mathematical formula that a pH number refers to is 1 x 10 to the power of -1 x (the pH number) moles/liter (a mole is a number of particles, I could give you the formula for that too, but that would probably just be confusing. Just know that a mole in this case is not a furry little creature that burrows under ground and can't see very well, but rather a specific number of particles)

For example, with a PH of 3, you have 1x10 to the power of -3, making the actual concentration 0.001 moles/liter

Answer 2

Any pH below 7 is acidic and above 7 is basic. pH 8.5 is slightly basic.

pH under 7 is acidic remember that :)

Answer 3

Both 3 and 4 are acidic on a pH scale, but 4 is closer to basic.
0-6.9 is acidic, 7 is neutral, 7.1-14 is basic.

Answer 4

Basic.

pH 7 is neutral. Anything lower (<7) is acidic and anything higher (>8) is basic or alkaline.

Answer 5

This is an acidic solution.

Answer 6

acidic

Answer 7

no