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Im doing a lab about learning to make predictions using the periodic table. I'm comparing four compounds from groups 1 and 2: magnesium carbonate, sodium carbonate, potassium carbonate and calcium carbonate.. mixing them all with water and i guess trying to find the similarities with the properties and reactions. They are all white powders but I'm not sure if my reactions are correct.
i am doing the same with four compounds from group 6 and 7 (or 16 and 17). copper (II) oxide, copper (II) chloride, copper (II) bromide and copper (II) sulfide.
I am also suppose to be noting which are soluable or not, but some in group one/two are and are not and same for group 6/7. so im a little lost. if you can help i would greatly appreciate it and since i may have made this a bit confusiing, basically i really need to know how can we use the periodic table to make predictions??
Solubilities are easy.
Soluable: Na+, K+, NH4+, nitrates, acetates, halides (not Pb, Hg, or Ag), sulfates (except Ca, Sr, Ba, and Pb)
Insoluable: Carbonates and phosphates (except Na+, K+, and NH4+) hydroxides (except strong bases (grp I, heavy grp II) and Ag+, Pb+2, Hg2+2, Hg+2, and sulfides (except Na+, K+, and NH4+)
So, if you have a solution and one of the ions up there are or aren't in it, then you can decide if there's a ppt or not:
soluable = no ppt
insoluable = ppt
So, the MgCO3 and the CaCO3 would form ppts. The others would not. Then, I THINK the CuO is a ppt and CuS04 is definitely a ppt.
There are a couple of exceptions, but you most likely won't need to worry about them.
=)
NO! CuSO4 is quite soluble; it is blue vitriol. Dissolved in H2O it gives a sky blue solution; dissolved in H2SO4 is is almost colorless and disolved in NH3OH is gives an intense cobalt blue.