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Mini-Quiz: pH Scale

by Ron Kurtus (30 May 2006)

Take this Mini-Quiz to check your understanding of the lesson material.

1. Why is the pH of pure water equal to 7.0?

It is 7.0 times as strong as unpure water

Water has 7 Hydrogen atoms

7.0 on the pH scale means neutral

2. If the pH of ammonia is 11.5 and bleach is 12.5, how much more alkaline is the bleach?

10 times, since 1 on the logarithmic scale represents tenfold

1.0, since 12.5 minus 11.5 equals 1.0

10,000,000 times

3. How do you use litmus paper?

You write on it to keep records of acids and bases

You wet it with a substance to see if it is an acid or base

You place it in a substance to change the liquid to an acid or a base

If you got all three correct, you are on your way to becoming a Champion in Chemistry. If you had problems, you had better look over the material again.

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