Why is phenolphthalein added to the beaker in the respiration experiment? a. It shows a color to let us know if the solution is acidic or basic. b. It takes part in the neutralization reaction. c. It speeds up the respiration reaction. d. It allows you to blow more air into the beaker during the experiment.

Human Anatomy & Physiology (11th Edition)
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Why is phenolphthalein added to the beaker in the respiration experiment?

a. It shows a color to let us know if the solution is acidic or basic.

b. It takes part in the neutralization reaction.

c. It speeds up the respiration reaction.

d. It allows you to blow more air into the beaker during the experiment.

 
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Acid-base indicators, commonly referred to as pH indicators, are compounds that alter colour in response to pH. Usually, they are weak acids or bases that gradually dissociate into ions when dissolved in water.

Few examples are bromocresol blue and methyl red indicators.

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