An acid-base titration is a neutralization reaction performed to determine: the concentration of an unknown acid based upon the concentration of a known base the concentration of an unknown acid based upon the concentration of a known acid the amount of salt that will be produced from the reaction of the acid and base the amount of water that will be produced from the reaction of the acid and base

A is your answer, "the concentration of an unknown acid based upon the concentration of a known base"

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.