Franz wants to investigate moon craters. He drips water into a shallow pan of flour. He holds the dropper at a different height each time he moves to a new area of the pan. Franz observes that the water drops make dents of differing sizes in the flour. Which type of experiment is Franz conducting? modeling

surveying

classifying

directly studying

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.