Question

The Cabbage Indicator

Your hypothesis about how to indicate various levels of pH, both acid and base with an indicator:

What liquids were used in the investigation?

Vinegar is an acid. Which liquids produced colors like vinegar?

Baking soda is a base. Which liquids produced colors like baking soda?

Did you see any that did not fit into either color group? If so which one(s)?

Could you determine the relative pH of the liquids by the varying color of the cabbage indicator?

Do you think you could add drops of a base solution into an acid solution until they indicate neutral?
How would you be able to tell when a neutral pH was obtained?


What did you find out from this investigation? Be thoughtful in your answer.

Answer 1

.A solution that serves as a pH indicator may be made using red cabbage, which is frequently available in homes. In essence, the color of the cabbage depends on the acidity of the solution and a pigment molecule called flavin or anthocyanin.

To determine whether a material is an acid or a base, red cabbage indicator is a purple-colored solution

Vinegar is an acid and its pH value is less than 7 and hence

Red color is produced

Baking soda is base and its pH value is greater than 7 and between 8-9  

and the color produced is sky blue

Bleach is the green which is also a basic and because the pH value is 10-11

Householder cleaner is having pH 11-13 which is basic and hence the yellow is the color of household cleaner .

A basic solution goes away from being basic and toward the center of the pH scale when an acid is introduced. The base is "neutralized" in this manner.

Learn more about pH value here

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