I have a question regarding the solubility in the quaternary system of NaCl-MgCl2-KCl-H2O.
I am trying to understand why in a lot of scenarios, the nacl or kcl is unsaturated.
for example, in 0.25 L of pure water, i added 80g of nacl, 12g of mgcl2 and 10g of kcl, mixing for 2 hours around 24.5 degC. In the end, only 65.3g of nacl, 9.88g mgcl2 and 8.08g kcl dissolved. S.G. is 1.211 and mass% of nacl is 21.58%, mgcl2 is 3.26% and kcl is 2.67%, but if we look at nacl and kcl, neither are saturated and the solution cannot dissolve more solids, why is this?
And when i test for chlorine, there is extra in the solution, is it just because of ions in the solution?