Problem: 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.

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We’re being asked to calculate the molarity (M) of an 18.2% by mass calcium chloride (CaCl2) solution. Recall that molarity is the ratio of the moles of solute and the volume of solution (in liters). In other words:


molarity (M)=moles soluteL solution


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

                          Calcium → Group 2A → +2 charge → Ca2+
                          Chloride → Group 7A → -1 charge → Cl-

We’re given the mass percent of calcium chloride (CaCl2) in water, 18.2%. Recall that mass percent is given by:

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Problem Details

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.

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

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