Acid-Base Lab
Lab Partners
Table # __________________
Royce
_______________________________ ______________________________
_______________________________ ______________________________ _______________________________
Hypothesis Chart – guess the state of each liquid and its pH BEFORE TESTTING!
#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Substance
ammonia
Acid/Base/Neutral?
base
at
baking soda
acid
lye
base
Milk
citrus
bare
bae
acid
Gentral
Peroxide
tomato juice acid
stomach arid arid
vineager
starch
turns
Koke
water
Soap
alcohol
toe creamer
oil
acid
bare
pH
S
s
12
7
n
4
2
3
s
11
S
Gave
5
arid
ventral 6
base
mental
base
7
s
11
neuter s
Background Questions:
1. What makes a solution an acid (acidic)?
2. What makes a solution a base (alkaline)?
Procedures – Part 1
At your table, you will find six dropper bottles that are numbered and labeled with
their contents.
•Spread a piece of paper towel down and six strips of red and six strips of blue
litmus paper down.
•Test each substance in the dropper bottles by placing one drop onto red and
blue litmus paper.
DO NOT TOUCH THE LITMUS PAPER WITH YOUR HANDS AND
DO NOT TOUCH THE DROPPER TO THE LITMUS PAPER
– you may contaminate your results or your future results by doing so!
•Label your paper towel with the samples that you tested and your results.
#1
ammonia
#2
water
#3
OJ
#4
milk
#5
vinegar
•The color of the litmus paper will tell you whether the substance is an ACID (both
strips are RED), a BASE (both strips are BLUE) or NEUTRAL (red stays red and blue
litmus stays blue).
•Take a picture of your results and paste it onto the next page.
•Rotate droppers with the other lab tables until you have tested all 18 substances.
Results for substances #1-6
Results for substances #7-12
Results for substances #13-18
Results – Part 1
List here which substances are an acid, a base or neutral
ACIDS
BASES
in
NEUTRAL
top
table
Procedures – Part 2
You will now repeat your procedures using pH paper
•Test each substance in the dropper bottles by placing one drop onto pH
paper.
Once again: DO NOT TOUCH THE pH PAPER WITH YOUR HANDS AND
DO NOT TOUCH THE DROPPER TO THE pH PAPER
•Label your paper towel with the samples that you tested and your results.
#1
ammonia
#2
water
#3
OJ
#4
milk
#5
vinegar
•The color of the pH paper will tell you the pH. Red is still the color of an acid and
blue the color of a base, but now you must compare to the known color scale that to
match the color of your substance + pH paper to the exact pH on the scale.
•Take a picture of your results and paste it onto the next page.
•Rotate droppers with the other lab tables until you have tested all 18 substances.
Results for substances #1-6
Results for substances #7-12
Results for substances #13-18
Results – Part 2
List the pH’s of the substances that you tested on the line below:
1
7
tomato
juice
citrus
at
14
ammonia
baking soda
milk
lye
peroxide
starch
stomach and
turns
Korevineager
alcohol water
a
Soap
tip
creamer