What volume of water is required to make 0.2 M solution from 16 mL of

1.	What volume of water is required to make 0.2 M solution from 16 mL of a 0.5 M solution ? Mcte(A) 24 ml840 mL(C) 6.4 mlL(D) 20 mL
Answer» let V be the volume needed to make 0.2M now no. of moles in the initial solution = 0.5(0.016) so, final concentration is 0.2 => 0.2 = 0.5(0.016)/V => V = 0.5*(0.016)/0.2 = 0.04 l = 40ml. so, we will add 40-16 = 24 ml more water to the solution to convert 0.5M to 0.2M

What volume of water is required to make 0.2 M solution from 16 mL of a 0.5 M solution ? Mcte(A) 24 ml840 mL(C) 6.4 mlL(D) 20 mL

Answer»

let V be the volume needed to make 0.2M

now no. of moles in the initial solution = 0.5*(0.016)

so, final concentration is 0.2 => 0.2 = 0.5*(0.016)/V => V = 0.5*(0.016)/0.2 = 0.04 l = 40ml.

so, we will add 40-16 = 24 ml more water to the solution to convert 0.5M to 0.2M