when the weak acid$-$strong base titration $=$ crotonic acid, $C4H6O2,ka=2\mathrm{.}04*{10}^{{?}_5}.$

A $40\mathrm{.}0mL$ sample of $0\mathrm{.}30mo\frac{l}{L}$ of your weak acid is titrated with a $0\mathrm{.}60mo\frac{l}{L}$ solution of NaoH$(aq),$ calculate the PH of the solution:

Give an answer for all the parts:

a$)$ before titration begins

b$)$ after $10\mathrm{.}0mL$ of NaoH$(aq)$ has been added.

c$)$ At the equivalence point

d$)$ Draw the PH curve for the titration, label the axes and the equivalence point.