Question

(References . An aqueous solution contains 4.60 g of calcium chloride, CaCl, per liter. What is the molarity of CaCl? Molarity - b. When the compound dissolves in water, the calcium ions, Ca solution? and the chloride ions, CH, in the crystal go into the solution. What is the molar concentration of each ion in the Molar concentration M Cat Molar concentration MCI Submit Answer Try Another Version Previous Next

Answer 1

a)

Molar mass of CaCl2,

MM = 1*MM(Ca) + 2*MM(Cl)

= 1*40.08 + 2*35.45

= 110.98 g/mol

mass(CaCl2)= 4.60 g

use:

number of mol of CaCl2,

n = mass of CaCl2/molar mass of CaCl2

=(4.6 g)/(1.11*10^2 g/mol)

= 4.145*10^-2 mol

volume , V = 1 L

use:

Molarity,

M = number of mol / volume in L

= 4.145*10^-2/1

= 4.145*10^-2 M

Answer: 4.14*10^-2 M

b)

[Ca2+] = [CaCl2]

= 4.14*10^-2 M

Answer: 4.14*10^-2 M

[Cl-] = 2*[CaCl2]

= 2*4.14*10^-2 M

= 8.28*10^-2 M

Answer: 8.28*10^-2 M