Answer: C 115 ml
Explanation:
If you have a solution of a monoprotic acid, it means that it has the form HA (just one Hydrigen atom). Therefore, one molecule of acid is going to react with just one molecule of NaOH.
So, if you have a solution of 100 ml of 0,2 HA acid, it is going to react with a 100 ml of 0,2 M NaOH solution. Beacause we know that the acid can be a little more concentrated than 0,2 M (0,2-0,3), it probably needs a little more than 100 ml of NaOH to react. So, the answer is C.
in 100 ml of 0,2M acid you can find 0,002 mol of HA
in 100 ml of 0,3 M acid you can find 0,003 mol of HA
in 100 ml of 0,2 M NaOH you can find 0,002 mol of NaOH
the answer can not be 200 because in 200 ml of 0,2 M NaOH there are 0,004 mol of NaOH, which is more than 0,003 mol.
