Chemistry SAT level 2 question.

Test Preparation SAT Subject Test Preparation
1

10ml of 1M H2SO4 is added dropwise to 100ml of 0.1M KOH. What is the approximate pH of the solution?
(A) 1
(B) 2
© 3
(D) 4
(E) 5

The ans is A

2

Sorry if i’m late: H2SO4----)2H+ + SO42- so 1 mole of H2SO4 gives 2 moles of H+ . There is (10.01)=0.01 moles of H2SO4 that mean there is 0.02 moles of H+ . There are (0.10.1)=0.01 moles of KOH that means there is 0.01 moles of OH- . H+ and OH- react in a ration of 1:1 so 0.01 moles of OH- neutralise leaving(0.02-0.01)= 0.01 moles of H+. concentration of H+ is moles/volume = 0.01/(0.11) that gives 0.098~0.1M of H+ . pH is log(1*10-1)=1 .PM me if you need a more detailed explanation