What is the molarity of a saturated solution of potassium sulfate if the solubility is 13 g per 100 g H2O at 25 °C? The density of the solution is 1.1g/mL

Question

souvik · Answer

what is the chemical formula of potassium sulfate?

souvik · Answer

Molar mass of potassium sulfate: 174.259 g/mol
the solubility of $K _2SO _4$ is13 g per 100 g at room temperature...
so total mass of the solution=100+13=113 g 
the volume of the solution=113/1.1=102.727 mL
so there is 13 g $K _2SO _4$ in 102.727 mL of the solution
or there is 13/174.259=0.075 mole of $K _2SO _4$
so the molarity is 0.075/102.727*1000=0.726(M)