affect, effect

affect (verb): to have an influence on, alter, cause a change in

Changing the pH of the solution may affect [alter for better or worse] the result.

affect (noun): observable feeling or emotion, or subjective experience of emotion associated with a thought

Most subjects in the trial showed a happy affect in response to the photos of the puppies.

effect (verb): to bring about, cause, produce, result in

Changing the pH of the solution can effect [bring about] a colour change.

effect (noun): the result of a change

The effect of changing the pH of the solution is ...

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