I will you assume you mean 20 ml and not 20 L. That would be a ridiculous volume for a titration.
Let the general equation be:
This tells us that 1 mole of HX produces 1 mole of XY.
The number of moles of HX is given by:
This is the number of moles of XY at the equivalence point.
XY is the salt of a weak acid and a strong base. The solution formed will not be neutral because the
By setting up an ICE table you can obtain a useful expression to get the pOH and hence the pH:
Where b is the concentration of the base i.e
Note that the total volume after the titration = 20 ml + 20 ml = 40 ml
We know that:
We would expect a result like this as the solution should be alkaline.