Find the activity coefficient of each ion at the indicated ionic strength:

$$\begin{gathered} \mathbf{\left(}\mathbf{a}\mathbf{\right)}{{\mathbf{SO}}_{\mathbf{4}}}^{\mathbf{2}\mathbf{-}}\mathbf{\to }\mathbf{(}\mathbf{\mu }\mathbf{=}\mathbf{0}\mathbf{.}\mathbf{01}\mathbf{M}\mathbf{)} \\ \mathbf{\left(}\mathbf{b}\mathbf{\right)}{\mathbf{Sc}}^{\mathbf{3}\mathbf{+}}\mathbf{\to }\mathbf{(}\mathbf{\mu }\mathbf{=}\mathbf{0}\mathbf{.}\mathbf{005}\mathbf{M}\mathbf{)} \\ \mathbf{\left(}\mathbf{c}\mathbf{\right)}{\mathbf{Ec}}^{\mathbf{3}\mathbf{+}}\mathbf{\to }\mathbf{(}\mathbf{\mu }\mathbf{=}\mathbf{0}\mathbf{.}\mathbf{1}\mathbf{M}\mathbf{)} \\ \mathbf{\left(}\mathbf{d}\mathbf{\right)}{\mathbf{\left(}{\mathbf{CH}}_{\mathbf{3}}{\mathbf{CH}}_{\mathbf{2}}\mathbf{\right)}}_{\mathbf{3}}{\mathbf{NH}}^{\mathbf{+}}\mathbf{\to }\mathbf{(}\mathbf{\mu }\mathbf{=}\mathbf{0}\mathbf{.}\mathbf{05}\mathbf{M}\mathbf{)} \end{gathered}$$

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