Name Date
pH Indicator Lab
Pre Lab
1. Complete the table with your predictions about each substance. (10 points)
Substance
Predict whether these substances are
acids, bases, or neutral.
White Vinegar
Hand Sanitizer
Baking Soda
Soap
Lime Juice
Drain Cleaner
Water
Rubbing Alcohol
Nail Polish Remover
Calculating pH
2. A simple calculation can be used to determine the pH of a substance.
Use the equation pH = -log[H+]. For example, when [H+] is 1 x 10 , the pH is found by
-9
calculating pH = -log[1 x 10 ] = 9. Find the pH or [H+] for the following substances. (14 points)
-9
Substance
[H+]
pH
Battery Acid
1 x 10
0
Eggs
8
Lemon Juice
1 x 10
-2
Ammonia
1 x 10
-11
Apple Juice
3.2 x 10
-4
Drain Cleaner
14
7-Up
3.2 x
10-4
Coffee
1 x 10
-5
Milk
1 x 10
-6
Distilled Water
1 x 10
-7
Stomach Acid
1 x 10
-1
Toothpaste
9
Grapefruit Juice
1 x 10
-3
Tomato Juice
1 x 10
-4
Sofie Lukic
12/21
acid
base
base
base
acid
base
base
acid
acid
0
1x10^-8
2
11
3.5
1x10^-14
3.5
5
6
7
1
1x10^ 9
3
4
3. How does the color of the solution help you determine the pH of each material? (2 points)
Lab Questions
4. Using the pictures in the RISE lesson, record the name of the substance and the color the
solution appears once the cabbage juice has been added. (6 points)
Name of Substance
