Biology
Acid/Base Hunt
Name____________________________________
Per_______________
1. Take out your Labquest and turn on (button on the top left) *NOTE: pH SENSOR MUST ALWAYS BE
STANDING UP*. Plug the pH sensor into channel 1, on the top face of the lab quest.
2. You and your partner will go around the room and will use the pH sensors to take the pH of the 16
marked substances
a. The pH sensor should be in the buffer at all times unless it is testing a substance.
b. Take the pH sensor out of the buffer and give it a quick rinse with the distilled water spray
and waste beaker at each table. The sensor is the little round bulb at the tip, so make sure
you wash that part implicitly.
c. Place the pH sensor in the unmarked solution. Let it sit for 10-20 seconds. Record the
average pH detected in the column marked “pH Detected.”
d. Give the pH sensor another rinse into the waste beaker before placing in a beaker or in the
buffer. *NOTE: ALWAYS RINSE YOUR pH SENSOR IN DISTILLIED WATER BEFORE AND AFTER
TESTING FOR A pH.*
3. Use the pH list below to compare your pH’s with the correct ones. Try to match substances with
their labels based on their pH. At the end of the period, the teacher will give you the key to compare
with your answers.
pH
Detected
Substance
Guess
Answer
Key
pH
Detected
A
B
C
D
E
F
G
H
Substance
Guess
Answer
Key
I
J
K
L
M
N
O
P
Solution
pH
Solution
pH
Aspirin
3.2
Milk
6.3
Baking Soda
8.5
Milk of Magnesia
8.0
Bleach
12.0
Saliva
6.0
Coca Cola
3.0
Tomato Juice
4.6
Dishwasher Soap
9.4
Toothpaste
9.0
Drano
12.9
Tums
6.5
Gatorade
3.5
Vinegar
2.5
Lemon Juice
2.8
Water
7.0
To clean up and be allowed to leave
1. Turn your paper name on it.
2. Return your lab quest to the cart
3. Wash your sensor off and place it back in the buffer solution,
standing upright. Bring it with its box to the cart.
4. Wash your waste beaker under flowing water. Bring, with the
distilled water container to the cart
5. Wipe your table down.
6. We should have
a.
b.
c.
d.
e.
15 lab quests
17 pH sensors
16 labeled beakers
8 rinse bottles
8 rinse beakers
7. Due tomorrow: acid/base activity (if you forget today