why do you use a graduated cylinder to measure out the desired volume of koh and h2so4, rather than a pipet or a buret?

When ammonia is removed the equilibrium shift to the right ( more ammonia is manufactured.

Explanation

The reaction of manufacture of ammonia  can proceed toward to the right or the left. The removal of ammonia gas from the reaction mixture favors the forward reaction  leading  to formation of more ammonia.