Answer to Question #117317 in General Chemistry for anonymous

Question

1) 3 g of Calcium Chloride (CaCl2) is added to 500 mL of water. It all dissolves. Determine the concentration of Chloride ions in the solution. (Hint: there is a trick here. Note: The chemical formula below that shows Calcium Chloride dissolving in water.)
CaCl2

Answer 1

Mass= 3g

$Moles =mass / rfm$

Moles= 3/111= 0.027moles

Concentration per litre solution is 2.7*10^-5M

The concentration in 500ml solution therefore becomes 1.35*10^-5 M