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?
• An acid 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?
• An acid/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