Question

A student has 20.0ml of 6.96 M CaCl2 solution the student adds water si the final volume of the solution is 250.0mL determine the new molarity of the solution

Answer 1

M1V1 = M2V2
BUT first convert the ml to L
20.0 ml % 1000 = 0.02 L
250 ml % 1000 = 0.25 L

M1V1 = M2V2
= 6.96x0.02 = M2x 0.25
= 0.14 = M2 x 0.25
M2 = 0.557