Which process uses a volume of solution of known concentration to determine the concentration of another solution?
(1) distillation (3) transmutation(2) substitution (4) titration

Titration

Explanation:  Titration is defined as the process where a solution of known concentration is used to determine the concentration of an unknown solution.

Volumetric titrations are usually used for neutralization reactions where an indicator is used to know the acidic or basic nature of solution.

The normality equation used at a point where neutralization occurs during the titration is:

= Normality of acid solution

= volume of acid solution

= Normality of basic solution

= Volume of basic solution

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.