Purveyors of salts from the Dead Sea advertise that it is healthy to bathe in a saturated solution of magnesium chloride (MgCl₂, 95.21 g/mol, K_sp = 740). How much magnesium chloride would you have to purchase to make up 10.0 L of bathwater saturated with magnesium chloride?

Question

Quizplus · Accepted Answer

The solubility of MgCl2 in water is 54.3 g/100 g H2O at 25 °C. So, in 10.0 L of water, the mass of MgCl2 that can be dissolved is:54.3 g MgCl2 / 100 g H2O * 1000 g H2O / 1 L * 10.0 L = 543 g MgCl2Therefore, you would need to purchase 543 g of magnesium chloride to make up 10.0 L of bathwater saturated with magnesium chloride.

Purveyors of Salts from the Dead Sea Advertise That It