Question

There are about 10 g of calcium, as Ca2+, in 1.0 L of milk. What is the molarity of Ca2+ in milk?

Answer 1

Answer:

Molarity of $Ca^{2+}$ in milk is $0.25 molL^{-1}$

Explanation:

Molarity is the number of moles of solute present in one liter of solution

Molarity is also known as the molar concentration of a solution.

Here we have 10 g of calcium as $Ca^{2+}$ , that is given mass = 10 g

volume is equal to 1 L that is 1000 mL

The molecular mass of calcium is 40 g.

Molarity = $\frac{no.of moles}{volume(L)}$

             = $\frac{Given mass}{molecular mass} *\frac{1000}{v(ml)}$

             = $\frac{10*1000}{40*1000} = 0.25 molL^{-1}$

Therefore the molarity of $Ca^{2+}$ in milk is $0.25 molL^{-1}$