Wastewater from a cement factory contains 0.280 g of ca2+ ion and 0.0220 g of mg2+ ion per 100.0 l of solution. the solution density is 1.001 g/ml. calculate the ca2+ and mg2+ concentrations in ppm (by mass).

The concentration of ions are 2.797 ppm and 0.212 ppm respectively.

Explanation:

To calculate the mass of solution, we use the equation:

Volume of gold = 100 L = 100000 mL    (Conversion factor:  1 L = 1000 mL)

Density of gold = 1.001 g/mL

Putting values in above equation, we get:

To calculate the concentration in ppm (by mass), we use the equation:

Mass of ions = 0.280 g

Putting values in above equation, we get:

Mass of ions = 0.0220 g

Putting values in above equation, we get:

Hence, the concentration of ions are 2.797 ppm and 0.212 ppm respectively.