Consider disposing of 2 liter 18 Molar solution of sulfuric acid by pouring it down the drain the faucet running. If the regulations required that any material put down the drain must have a pH greater than 2.0 and less than 12.5  in order to protect the aquatic environment and the bacteria in the local wastewater treatment plant  not to mention the pipe in the sewerage system.  There is two options to dispose of the acid safe and quickly:

a-Dilution

b-Neutralization to Na2SO4 and H2O with NaOH.

1- Find the pH of the of the concentrated H2SO4

2- Find the volume to which the 2L of  H2SO4  would have to be diluted in order to raise the pH to 2.1.

3- Calculate the quantity of NaOH needed to neutralize the 2 liter 18

Molar solution of sulfuric acid.