A buffer solution with a $pH$ of $4\mathrm{.}0$ is made by dissolving $xg$ of potassium ethanoate $(C{H}_3\frac{C}{O}OK)$ in a solution of ethanoic acid $(C{H}_3\frac{C}{O}OH).$ The final volume of the buffer solution is $500c{m}^3$ and the final concentration of the ethanoic acid is $0\mathrm{.}250mold{m}^{-3}.$ Calculate $x$ in $g$ for potassium ethanoate. $K_a=1\mathrm{.}74{10}^{-5}mold{m}^{-3}$

NOTE $1$: Put your answers to TWO decimal places

NOTE $2$: ONLY Type a number in the blank

Concentration of $H^{+}$ions $=$Blank $1{10}^{-4}mold{m}^{-3}$

Concentration of $()-$Blank $2{10}^{-2}mold{m}^{-3}$

Mass of Potassium Ethanoate $)g$

Blank $1$

Blank $2$

Blank $3$

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