Question

what volume of water must be added to 500cm3 of a 0.12M solution of sodium carbonate to give a 0.040M solution?

Answer 1

\[\frac{ n }{ V } = M\]
this is the equation you need to know.
you know the current M and V.
so what's the current n?

Answer 2

V in liter

Answer 3

M1V1=M2V2
500 X 0.12 = 0.04 X V2
500 X 0.12 / 0.04 = V2
1500 = V2
now total volume should be 1500 cm3 is required. you have already 500 cm3 as a parent solution, (1500-500=1000) so u have to add 1000 cm3 in 500 cm3 solution of 0.12 M

Answer 4

yeah, I forgot that equation exist, hahah..

Answer 5

:)

Answer 6

thanks!!