Acids and bases

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Acids and bases

Below is a $\log C-p H$ diagram for $10^{-3} M$ hydrogen sulfide $\left(\mathrm{H}_{2} \mathrm{~S}\right),$ a diprotic acid, with $\mathrm{p} K_{a 1}=6.99$ and $\mathrm{pK}_{a 2}=12.92 .$

a. Label the lines with the species they represent, and assign correct values to the axes.

b. Draw lines for $\mathrm{H}^{+}$ and $\mathrm{OH}^{-}$ on the diagram.

c. What is the $\mathrm{pH}$ of a solution made by mixing $10^{-4} \mathrm{M} \mathrm{NaHS}$ and $9 \times 10^{-4} \mathrm{M}$ $\mathrm{H}_{2} \mathrm{~S} ?$

Acids Bases chemistry Equilibrium-Constant

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