For a chem lab, i was given a table that results when pairs of chemical solutions are mixed.For each set of compounds that formed a precipitate, I had to determine the precipitate. I have done that and now one of the questions i have to answer based on the lab: Based on your results (and only your results), would you expect the following compounds to be soluble or insoluble? The compounds are
1)Li2CrO4
2)Mg(NO3)2
3)CaSO4
4)CuCl2
What i do not know is how to I tell, based solely on my results which of these would be soluable or insoluable. I would appreciate any intel. Thanks
did you find that all group 1 metal salts were soluble?
did you find all nitrates were soluble?
did you find all chlorides were soluble?
what about calcium compounds? What about sulfates?
thats not an answer...
To determine whether a compound is soluble or insoluble based on your results, you need to refer to the solubility rules. Solubility rules are guidelines that indicate which compounds are generally soluble or insoluble in water.
Here are the solubility rules that can help you determine the solubility of the compounds you listed:
1. Most nitrate (NO3-) salts are soluble.
2. Most chloride (Cl-) salts are soluble, except those of silver (Ag+), lead (Pb2+), and mercury (Hg2+).
3. Most sulfate (SO4^2-) salts are soluble, except those of calcium (Ca2+), strontium (Sr2+), barium (Ba2+), and lead (Pb2+).
4. Most hydroxide (OH-) salts are insoluble, except those of alkali metals (Li+, Na+, K+, etc.) and some alkaline earth metals.
5. Most sulfide (S^2-) salts are insoluble, except those of alkali metals and some alkaline earth metals.
Now let's apply these solubility rules to the compounds you have listed:
1) Li2CrO4: Lithium chromate. Based on the solubility rules, all lithium salts are soluble. So, Li2CrO4 is expected to be soluble.
2) Mg(NO3)2: Magnesium nitrate. According to the solubility rules, nitrate salts are generally soluble. Therefore, Mg(NO3)2 is expected to be soluble.
3) CaSO4: Calcium sulfate. Calcium sulfate is insoluble according to the solubility rules as most sulfates are soluble except for those of calcium, strontium, barium, and lead. Therefore, CaSO4 is expected to be insoluble.
4) CuCl2: Copper(II) chloride. Chloride salts are generally soluble, except those of silver, lead, and mercury. Therefore, CuCl2 is expected to be soluble.
Based on the solubility rules and your results, the expected solubility for the compounds you listed would be:
1) Soluble
2) Soluble
3) Insoluble
4) Soluble