Weak Acid $-$strong Base Titration:

when the weak acid$-$strong base titration $=$ crotonic acid, $C4H6O2,ka=2\mathrm{.}04$ times ${10}^n-5.$ and when the value salt of weak acid $($Buffer$)$ is $Na+C4H5O2-$

A $40\mathrm{.}0$ mL 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.

Buffer:

A buffer solution is prepared by dissolving $100\mathrm{.}0$gram of the weak acid and $100\mathrm{.}0$gram of its salt in $1\mathrm{.}0L$ of water. Determine the $PH$ :

Make sure to answer all the parts;

e$)$ of the buffer

f$)$ after $0\mathrm{.}2$molHCl was added to the initial buffer $($assume volume remains $1\mathrm{.}0$L$)$

g$)$ after $0\mathrm{.}25$molNaOH was added to the initial buffer $($assume volume remains $1\mathrm{.}0L)$