A liquid mixture has 12.6 parts per thousand of MgCl2 dissolved.

Calculate the [Cl-] in ppt?

Im stuck plz help!

there are two Cl- for each magnesium chloride unit. 26.2 ppt for chloride ions

Could you explain me, how u reached to that answer?

I think Mr. Pursley hit a 6 instead of a 5 and meant 2*12.6 = 25.2 ppt Cl^-.

To calculate the concentration of Cl- in parts per thousand (ppt) in a liquid mixture, you need to know the concentration of MgCl2 in ppt.

Given that the liquid mixture has 12.6 parts per thousand of MgCl2 dissolved, you can assume that all the Cl- ions come from MgCl2.

Since MgCl2 dissociates into one Mg2+ ion and two Cl- ions, the concentration of Cl- will be twice the concentration of MgCl2.

First, calculate the concentration of Cl- ions in ppt:

[Cl-] (ppt) = 2 * [MgCl2] (ppt)
= 2 * 12.6
= 25.2 ppt

Therefore, the concentration of Cl- ions in the liquid mixture is 25.2 parts per thousand (ppt).