6.2.4: Preocedure-Measuring the pH of Common Household Chemicals.

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Page ID: 567841

Deboleena Roy
American River College

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Step 4 Procedure

Measuring the pH of common household chemicals

Some examples of common household chemicals that can be tested for pH are vinegar, carbonated soda or water, dilute solutions of shampoo and baking soda. For powders, dissolve 3 teaspoon of powder in 100 mL of water. For shampoo, dissolve 1 tablespoon of shampoo in 100 mL water. Use a kitchen measuring cup for 100 mL of water. Choose three other chemicals or solutions not in this list for this experiment. Make a solution with the powders as necessary. Add an equal volume of cabbage indicator to the solutions of household chemicals. Note the color and compare the colors to the standards pH 2 to 12. Predict the approximate pH of the household chemicals/solutions and take pictures. Do not dispose of the chemicals yet. Use clear plastic cups to perform this part of the experiment.

Note: Coffee, tea, and milk have strong coloration and may mask the color of the cabbage indicator. This in turn may lead to inconclusive results in the pH determination. For this experiment, it is best to choose solutions that are colorless to pale in color.

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