1. Acids and Bases a. How reliable are the indicators (red cabbage and phenolphthalein) in the testing of these household substances?

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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1. Acids and Bases

a. How reliable are the indicators (red cabbage and phenolphthalein) in the testing of these household substances? 

b. Suggest how these tests be converted to specific (numeric) pH values.

Results (Data):
Substance
Red cabbage
Phenolphthalein
Acid/Base
Lemon juice
Light Red
No color change
Acid
Vinegar
Red
No color change
Acid
Window Cleaner
Greenish-Blue
Violet
Base
Toilet Cleaner
Purple
No color change
Acid
Baking soda
Blue
Light Pink
Base
Baking powder
Blue
No color change
Base
NaCl (table salt)
Bluish-Purple
No color change
Neutral
Milk
Light Purple
No color change
Neutral
Unknown #1
Blue
No color change
Neutral
Unknown #2
Bluish-Green
Light Pink
Base
Unknown #3
Red
No color change
Acid
Transcribed Image Text:Results (Data): Substance Red cabbage Phenolphthalein Acid/Base Lemon juice Light Red No color change Acid Vinegar Red No color change Acid Window Cleaner Greenish-Blue Violet Base Toilet Cleaner Purple No color change Acid Baking soda Blue Light Pink Base Baking powder Blue No color change Base NaCl (table salt) Bluish-Purple No color change Neutral Milk Light Purple No color change Neutral Unknown #1 Blue No color change Neutral Unknown #2 Bluish-Green Light Pink Base Unknown #3 Red No color change Acid
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