Testing the Ph of Common Household Substances Lab

Topics: PH, Acid, PH indicator Pages: 5 (1249 words) Published: September 18, 2013
Testing the pH of Common Household Substances Lab

Background Information:
The pH scale is used to determine the acidity or basicity level of liquid solutions. If a solution scores a pH level of 1-6 it is an acidic solution, 1 being the most acidic and 6 being the least acidic. If a solution rates a pH level of 7 it is a neutral solution, meaning it is neither an acidic nor a basic solution. Lastly, if a solution is 8-14 on the pH scale it is a basic solution, 8 being the least basic and 14 being the most basic. The products that are used on a daily basis in your house can also be acidic solutions, basic solutions, or even neutral solutions.

Hypothesis:
Food products are likely to be weak acids because food is not slippery, you can eat it which is why it’s a weak acid, and because foods are sour. Cleaning products are predicted to be strong bases because they consist of a very key characteristic of bases; they are slippery. Personal care products are predicted to be neutral solutions because they are not corrosive like acids and bases that can harm your skin.

Materials:
12-well dish
Paper indicators
oRed litmus
oBlue litmus
opH paper
Various common household substances
oShampoo
oLemon juice
oGreen tea
oSprite
oDetergent
oMilk
oWindex

Procedure:
1.Obtain a small sample of each substance to be tested. Place the substance in one well of the 12-well dish. 2.Test the effect of each sample on red litmus and blue litmus to determine if the substance is acidic, basic or neutral. (Make sure if you have a substance from EACH product type) 3.Test each sample with universal indicator paper. Match the color of the universal indicator paper with the indicator chart to determine the approximate pH value of the substance. Record the pH value and classify the substance as a: •strong base (pH=11-14)

weak base (pH=8-10)
approximately neutral (pH=7)
weak acid (pH=4-6)
strong acid (pH=0-3)

Observation:
SubstanceProduct TypeRed LitmusBlue LitmuspH PaperpH ValueAnalysis Acid or Base?
ShampooPersonal CareStayed RedPinkStayed OrangepH 4Weak Acid Lemon JuiceFoodStayed RedRedBright RedpH 1Strong Acid
Green TeaFoodStayed RedStayed BlueStayed OrangepH 7Neutral SpriteFoodStayed RedPinkStayed OrangepH 4Weak Acid
MilkFoodLight PurpleStayed BlueYellowpH 7Neutral
DetergentCleaningBlueStayed BlueYellowpH 10Base
WindexCleaningBlueStayed BlueLight GreenpH 9Weak Base

Results:
The three classes of household products tested for pH levels in this lab were; cleaning, personal care, and food products. The only personal care product that was tested in this lab was shampoo; which was a very weak acid, it scored 4 on the pH scale, when tested with red litmus it stayed red, but turned pink when tested with blue litmus and stayed orange when tested with pH paper. Lemon juice was the first food product tested it proved to be a very strong acid; red litmus stayed the same color, blue litmus turned red and pH paper turned bright red, scoring a 7 on the pH scale. The second food product that was tested was green tea which was neutral; it stayed red with red litmus, stayed blue with blue litmus and stayed orange with pH paper and therefore, scored a pH level of 7. The third food product that was tested was Sprite, which was a weak acid, the red litmus stayed red, blue litmus turned pink and the pH paper stayed orange scoring a pH level of 7. The last food product that was tested was milk, which turned out to be neutral, when tested with red litmus it turned light purple, the blue litmus stayed blue and the pH paper turned yellow, which scored a pH level of 7. Lastly, cleaning products were tested. The first cleaning product tested was detergent which was a base, the red litmus turned blue, the blue litmus stayed blue and the pH paper turned yellow, giving it a pH level of 10. The last cleaning product tested was Windex which was a weak base; it turned...
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