Grace and Sam are working together to see why their experimental value is different from the expected value. Sam says maybe we made a mistake in our measurements or calculations. Which of these are ways they can decide if Sam is right

i wish i could but this one is weird give me abc and i can solve it.

it's c (engineer's do their work with mechanical stuff not on any living being)

answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.