Step 1

Reactant

Co(NO_{3})_{2}(aq) → Co^{2+} (aq) + 2 NO_{3}^{-} (aq)

KOH (aq) → K^{+} (aq) + OH^{-} (aq)

Reaction: double displacement

Product

Co^{2+} (aq) + 2 OH^{-} (aq) → Co(OH)_{2} (s)

K^{+} (aq) + NO_{3}^{-} (aq) → KNO_{3} (aq)

Balance equation for the reaction:

Co(NO_{3})_{2}(aq) + 2 KOH (aq) → Co(OH)_{2} (s) + 2 KNO_{3} (aq)

Step 2

**$\mathbf{2}\mathbf{.}\mathbf{00}\mathbf{}\overline{)\mathbf{L}}\mathbf{}\mathbf{\times}\frac{\mathbf{2}\mathbf{.}\mathbf{00}\mathbf{}\mathbf{mol}\mathbf{}\mathbf{Co}{\mathbf{\left(}{\mathbf{NO}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{2}}\mathbf{}}{\mathbf{1}\mathbf{.}\mathbf{00}\mathbf{}\overline{)\mathbf{L}}}$= 4.00 mol Co(OH) _{2}**

**$\mathbf{2}\mathbf{.}\mathbf{00}\mathbf{}\overline{)\mathbf{L}}\mathbf{}\mathbf{\times}\frac{\mathbf{3}\mathbf{.}\mathbf{00}\mathbf{}\mathbf{mol}\mathbf{}\mathbf{KOH}}{\mathbf{1}\mathbf{.}\mathbf{00}\mathbf{}\overline{)\mathbf{L}}}$= 6.00 mol KOH**

Step 3

from Co(NO_{3})_{2}(aq)

$\mathbf{4}\mathbf{.}\mathbf{00}\mathbf{}\overline{)\mathbf{mol}\mathbf{}\mathbf{Co}{\mathbf{\left(}{\mathbf{NO}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{2}}}\mathbf{\times}\frac{\mathbf{1}\mathbf{}\mathbf{mol}\mathbf{}\mathbf{Co}{\mathbf{\left(}\mathbf{OH}\mathbf{\right)}}_{\mathbf{2}}}{\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}\mathbf{Co}{\mathbf{\left(}{\mathbf{NO}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{2}}}}$**= 4.00 mol Co(OH)**_{2}

from KOH

$\mathbf{6}\mathbf{.}\mathbf{00}\mathbf{}\overline{)\mathbf{mol}\mathbf{}\mathbf{KOH}}\mathbf{\times}\frac{\mathbf{1}\mathbf{}\mathbf{mol}\mathbf{}\mathbf{Co}{\mathbf{\left(}\mathbf{OH}\mathbf{\right)}}_{\mathbf{2}}}{\mathbf{2}\mathbf{}\overline{)\mathbf{mol}\mathbf{}\mathbf{KOH}}}$**= 3.00 mol Co(OH) _{2}**

limiting reactant → KOH

The drawings below represent aqueous solutions. Solution A is 2.00 L of a 2.00-M aqueous solution of copper(II) nitrate. Solution B is 2.00 L of a 3.00-M aqueous solution of potassium hydroxide.

Determine the concentrations (in M) of all ions left in solution after mixing and the mass of solid formed.

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