We’re being asked to **calculate the molarity (M)** of **an 18.2% by mass calcium chloride (CaCl _{2}) solution**. Recall that

$\overline{){\mathbf{molarity}}{\mathbf{}}{\mathbf{\left(}}{\mathbf{M}}{\mathbf{\right)}}{\mathbf{=}}\frac{\mathbf{moles}\mathbf{}\mathbf{solute}}{\mathbf{L}\mathbf{}\mathbf{solution}}}$

We first need to determine the number of moles of** calcium chloride**:

Calcium → Group 2A → +2 charge → Ca^{2+}

Chloride → Group 7A → -1 charge → Cl^{-}

We’re given the mass percent of calcium chloride (CaCl_{2}) in water, **18.2%**. Recall that ** mass percent** is given by:

Calculate the molarity of an aqueous solution that is 18.2% by mass calcium chloride. You might need to know that the density is 1.18 g/mL.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Molarity concept. You can view video lessons to learn Molarity. Or if you need more Molarity practice, you can also practice Molarity practice problems.