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05.06 Lab Time : Acid & Base Indicators

Physical Science
by

Arline Gonzalez

on 18 June 2014

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Transcript of 05.06 Lab Time : Acid & Base Indicators

HYPOTHESIS
CONCLUSION
1. Place the five substances in order of increasing pH — from most acidic to most basic.
Tea, Lemon Juice , Eye drops, Detergent , Bleach
2. Orange juice has a pH of 4. What color would you expect the paper test strip to be after it is dipped in a sample of orange juice?
It would be purple.
3. Determining the pH of substances such as purple grape juice and catsup using test strips can be difficult. Why?
It would be difficult to see the color change since purple is already a dark color.
4. Tear–free shampoos are advertized as having a pH similar to that of human tears. What pH would you expect tear–free shampoos to be? Use evidence from the lab activity to support your response.
I would expect it to be neutral because the eye drops are the same as tear free shampoo, It doesn't irritate the eye or else people wouldn't use them.
5. the approximate hydronium ion concentration and hydroxide ion concentration in a cup of tea is hydronium ion.
6. hydroxide ion
I think ,
Bleach - Neutral
Eye Drops - Base
Detergent - Base
Tea - Acid
Lemon Juice - Acid

05.06 Lab Time: Acid and Base Indicators
Detergent
Bleach
Tea
Eye Drops
Lemon
Juice
Green
Yellow
>12
Base
Light Green
Blue
8 - 10
Base
Brown
Purple
4 - 6
Acid
Yellow
Red
1 - 3
Acid
Light Blue
Blue
7
Neutral
Initial color of solution
Final color of solution
pH range on test strip
Acid/Base/Neutral
DATA CHART
Full transcript