5M x (20/50) = ?? OR if you prefer,
mL x M = mL x M
(Note: Technically, this method works only if we are assuming that the problem says 20 mL 5M NaCl "is added to enough water to make 50 mL of solution" which is another way of saying that the two solutions are additive. Technically, 20 mL of 5M NaCl + 30 mL water may NOT add up to 50 mL.)
Determine the final concentration of 20ml of 5M NaCl of solutions after 30ml of water has been added.
1 answer