Determining an Enthalpy Change of Reaction

Determining An Enthalpy Change of Reaction.

Results:

Time /mins Temperature / °C

Trial 1 Trial 2 Trial 3

0 24 25 23

0.5 23 23.5 24

1.0 23 23.5 24

1.5 23 23.5 24

2.0 23 23.5 24

2.5 23 23.5 24

3.0 23 30 24

3.5 39.5 35 34

4.0 39 41.5 35

4.5 38 48 36

5.0 37.5 54 37

5.5 37 57 36

6.0 45 59 36

6.5 50 60.5 38

7.0 53 61 41

7.5 56 61 53

8.0 58 60 62

8.5 58 59.5 63.5

9.0 59.5 59 63.5

9.5 60 57.5 62.5

1* 66- 23.5 = 46.5

The temperature increases a few readings after adding the Zinc because the reaction starts to occur. It then reaches it's peak and begins to decline.

Reaction occuring:

CuSO4 (aq) +Zn (S) →Cu(S) + ZnSO 4 (aq)

Observations:

Blue + Grey fine powder → Red + Clear

Ionically:

Cu2+ (aq) + Zn(S) → Cu(S) + Zn 2+(aq)

Calculations:

Copper Sulphate: concentration- 1.0 mol/dm3

Volume – 0.025 dm3

mol= C * V

= 1 * 0.025

= 0.025 mol