1. Acid Base
Review

2. What is the pH scale?
A numerical scale 0-14 that is used to measure how
acidic or alkaline a substance is.

3. What is phenopthalein?
A base indicator. It turns bright pink when put into a
base.+

4. What is bromythymol blue?
 Anacid indicator. It turns yellow when placed in an
acid.

5. What is Universal Indicator and how
can you use it to test an unknown
solution?
 Anacid/base indicator. It turns different colors
depending upon the strength of the acid and base.
You use a color chart to find the number that
corresponds to the pH scale.

6. How does the pH number of a
strong acid compare to the pH of a
weak acid?
A strong acid will have a pH of 0-1.
A strong base will have a pH of 13-14

7. What is the difference between an
acid and a base?
 An acid has a H ion.
A base has a hydroxide ion.

8. What sort of foods are acids?
 lemons, oranges, anything with citric acid. Also
milk is slightly acidic.

9. What sort of liquids are cleaners?
 Bases

10. What do acids taste like?
 sour

11. What liquid is neutral?
 pure water

12. How can you compare
strengths of acids using the pH
scale?
 For every number difference on the pH
scale, it is that many power of ten times more
acidic.
 Hard to explain…….. For instance….. If you’re
comparing something with a pH of 2 to
something with a pH of 6…. the pH of 2 is ten
thousand times more acidic than the pH of
six.
 6-2=4……….. that means it’s 10 to the fourth
power stronger. Ten to the fourth is 10,000

13. What is the pH range of normal
rain?
5.6-6.5

14. What is the pH range of acid rain?
 Below 5.6

15. What acid does carbon dioxide
form in water?
 Carbonic Acid

16. What is meant by the term
"neutralization"?
 Adding base to an acid until it becomes pH close to
7