Name: 6. Based on what you\'ve learned in Experiment 3, use the differences in t

Question

Name: 6. Based on what you've learned in Experiment 3, use the differences in the physical properties of BaSO4, K:sOs and CaHs (naphthalene) and develop a procedure for separating a mixture containing all three of these compounds. 15 pts SHOW ALL WORK FOR FULL CREDIT) 7. Find the empirical formula of a compound containing 42.93% carbon and 57.14% oxygen by weight. (1S pts SHOW ALL WORK FOR FULL CREDIT s, why was water added to the magnesium after its initial burning in experiment # 47(8pts) 9. The chemical formula of blue copper sulfate is CuSO SH O. Determine the mass percent of water in blue copper sulfate. (15 pts SHOW ALL WORK FOR FULL CREDIT)

Explanation / Answer

Ans 6 . Using a very basic concept that like dissolves like, we can separate the mixtures .

We all know that naphthalene is organic compound and the other two given compounds are inorganic .

So , the following procedure can be used :

1.place the mixture in an organic solvent like acetone .The naphthalene being organic remains dissolved in the acetone while the other two sulphates will precipitate out .

2.extract naphthalene by crystallisation process.

3.Now ,place the ppt. of sulphates in water . We know that BaSO4 is insoluble in water ,so it will precipitate out and K2SO4 remains in water .

4. Extract potassium sulphate by crystallisation .

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