Investigate the displacement reaction between Zinc Metal and Copper Sulphate.
The displacement reaction involves the reaction between an element and a compound where the element takes the place of or displaces another element from the compound. The element higher in the reactivity series will replace the element lower in the reactivity series.
APPARATUS AND MATERIALS
* Powdered zinc metal
* 1.0 mol dm-3 copper (II) sulphate solution
* Propanone (acetone)
* 100cm3 beaker or conical flask
1. 50cm3 of copper (II) sulphate was placed into the 100cm3 conical flask 2. One (1) gram of zinc powder was added to the flask and stirred constantly 3. All visual observations were recorded
4. After the reaction was completed the liquid was poured off and the copper formed was washed thoroughly with distilled water and then with ethanol 5. The copper was then dried with propanone (acetone)
6. The mass of the copper produced in the reaction was weighed and then recorded.
* Petri dish and the filter paper = 44.85g
* Petri dish +filter paper + copper – Petri dish + Filter paper = mass of Cu = 47.88g -40.12 g =7.76 g
Mass of Copper Obtained = 7.76 g
Visual appearance = Color change Greenish Brown.
1. CuSO4 (aq) +Zn(s) ZnSO4(aq) + Cu (s)
Ratio: 1 Cu: 1Zn
1g Zn replaces 1g of Cu
1 cm3= 1 / 1000 x mol CuSO4
50 cm3= 0.001 x 50 mol CuSO4
= 0.05 mol CuSO4
There are 0.05 mol CuSO4 in 50cm3
Mass = Moles x Molar Mass
= 0.05 x 160
= 8 g CuSO4
Theoretical Yield of the copper = 8g
2. Percentage Yield of copper = actual yield /theoretical yield x 100%.
7.76/8 x 100% = 97%
Zinc is higher...