Question

(PLEASE HELP)**Which best describes how a pH test strip works?**


Molecules in the paper react differently with hydronium and hydroxide ions.
The paper dissolves when placed in acids, but not when placed in bases.
Polar molecules affect the paper differently than nonpolar molecules.
The paper uses the low surface tension of water to attract acidic particles.

Answer 1

I think it's A.

Answer 2

Which is a correct method used in a scientific experiment involving acid and base solutions?


using a pH test strip to measure the oxygen content of a solution
adding an indicator to a solution to test its acidity
adjusting the recorded pH measurements to prove the hypothesis
measuring the pH of a test strip by dipping it into an indicator

Answer 3

add an indicator?