Question $3(1$ point$)$

Phosphate buffers are essential in living systems. What is the $pH$ of a solution which contains $0\mathrm{.}150M{H}_{3}P{O}_4$ and $0\mathrm{.}275MNa{H}_{2}P{O}_4?$

Data:

$K_a(H_{3}P{O}_4)=7\mathrm{.}2{10}^{-3}$

$2\mathrm{.}58$

$2\mathrm{.}28$

$2\mathrm{.}88$

$2\mathrm{.}41$

Question $4(1$ point$)$