If the density and the volume of a liquid are known, its mass can be found by A) dividing the volume by the mass. B) dividing its density by its volume. C) multiplying the volume and density. D) multiplying the mass and the volume.

i do not get it   at all

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.