Sam's Schoolwork - Chemistry - Lab 4.4

Problem
What reaction products result when the following substances are mixed?

Prediction
- Ba(OH)2(aq) + H2SO4(aq) = BaSO4(s) + H20(l) -- We'll know by the PH and whether there is a precipitate formed or not.
- Zn(s) + CuSO4(aq) = Cu(s) + ZnSO4(aq) -- Color change from blue, and an orange solid forms.
- CaCl2(aq) + NaCO3(aq) = CaCO3(s) + 2NaCl(aq) -- A precipitate forms, and the pink color dissapears.
- CoCl2(aq) + NaOH(aq) = Co(OH)2(s) + NaCl(aq) -- A precipitate forms and the pink color dissapears.
- Ca(s) + 2H20(l) = Ca(OH)2(s) +H2(g) -- A solid forms, and it bubbles.
- HCl(aq) + NaCH3COO(aq) = NaCl(aq) + CH3COOH(aq) -- As CH3COOH is Vinegar, there will be a noticeable smell.
- Mg(s) + 2HCl(aq) = H2(g) + MgCl2(aq) -- It bubbles, and the magnesium ribbon dissapears.

Design
On Sheet

Materials
On Sheet

Procedure
On Sheet


Evidence
- On the first solution we tested, the Ba(OH)2 turned red litmus blue, and was a base. The H2SO4 turned blue litmus red, indicating an acid. The result was much less acidic.
- One reactant had a blue color, the products were a black, red - tinted powder and a slightly less blue solution.
- There was a precipitate formed, making the water murky.
- The pink disappeared, and a blue precipitate formed.
- There was lots and lots of bubbles. There was sound and heat produced.
- There was a slight vinegar smell.
- It bubbled a little bit. The magnesium couldn't decide whether to float or not.

Analysis
The first solution tested was not entirely neutral, but slightly acidic. I predicted that an orange solid would form in the second solution, but it was more of a black color. In the fourth solution, the  product created was blue, which I did not predict. On the last product tested there was a much slower reaction than I had anticipated. The third, fifth and sixth solutions tested were all relatively equal to what I had predicted.

Evaluation
It was a fairly accurate test; it would have been better if they had been in isolated containers with no other atoms to influence it. I think some Oxide coating interfered a little on some of the reactions.