Question

In the laboratory you dissolve 22.7 g of cobalt(II) chloride in a volumetric flask and add water to a total volume of 250 mL.

What is the molarity of the solution? M.

What is the concentration of the cobalt(II) cation? M.

What is the concentration of the chloride anion? M.

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Answer 1

0.6988M

Step-by-step explanation:

Cobalt (II) chloride = CoCl2 Molar mass = 129.839 g/mol

Molarity = moles/liter of solution

`Moles = 22.7g * (1mol)/(129.893g) = 0.1747moles`

`Liters \: of \: solution = 250 ml * (1 L)/(1000 ml) = 0.250 L`

`Molarity = (0.1747 moles)/(0.250 L)=0.6988 M`