Mini-Quiz: pH Scale

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

   It is 7.0 times as strong as unpure waterSorry, not correct. Try another button. Water has 7 Hydrogen atomsGood try, but not right. Select another answer. 7.0 on the pH scale means neutralThat is correct. You know about the pH scale.

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 tenfoldCorrect. You know your Chemistry! 1.0, since 12.5 minus 11.5 equals 1.0Oops! Wrong answer. Re-read the question and try again. 10,000,000 timesSorry, not correct. Try another button.

3. How do you use litmus paper?

   You write on it to keep records of acids and basesGood try, but not right. Select another answer. You wet it with a substance to see if it is an acid or baseThat is correct. You know about the pH scale. You place it in a substance to change the liquid to an acid or a baseSorry, not correct. Try another button.

Pick an answer to see instant feedback. Re-read the lesson if you miss one.