8. H2SO4 is a diprotic acid, so the concentration of hydrogen ions is twice the concentration of H2SO4
.'. [H+] = 2*[H2SO4]
= 2*0.0115
=0.023 mol/L
then using pH = -log[H+],
pH = 1.638 which is closest to C
15. with this equilibrium, we can see that there are 4 moles of gas on the LHS...