Potasium Hydroxide Lab

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Data Collection and Data Processing The experiment was on the basis of the concentration of Potassium Hydroxide affecting the temperature of water that it is dissolved in. One person stirred in the different concentrations of Potassium Hydroxide while the other measured the temperature as it rose after the pellets dissolved. At times it was difficult to ensure that the pellets were completely dissolved within the solution.
Raw Data Table: The temperature of water after dissolving different concentrations of Potassium Hydroxide in it.
Concentration of Potassium Hydroxide (g/ml) (±0.01 g/ml)
Uncertainties of Concentration (±g/ml)
Temperature of Water (°C) (±0.2 °C)

Trial 1
Trial 2
Trial 3

Initial
Final
Initial
Final
Initial
Final
0.01
0.0011
18
19
24
24
22
23
0.03
0.0012
24
27
24
26.5
23.5
26
0.05
0.0015
24
29
21
27
22
28
0.07
0.0017
24
31
24
31
24
30
0.09
0.0019
24
34
24
33
24
33

Processed Data Table: The change in temperature of water after dissolving Potassium Hydroxide in it.
Concentration of Potassium Hydroxide (g/ml)
Uncertainties of Concentration (±g/ml) Change in Temperature of Water (°C) (±0.2°C)

Trial 1
Trial 2
Trial3
Average
0.01
0.0011
1
0
1
0.67
0.03
0.0012
3
2.5
2.5
2.67
0.05
0.0015
5
6
6
5.67
0.07
0.0017
7
7
6
6.67
0.09
0.0019
10
9
9
9.33

Calculations
ΔT = 19 – 18 = 1°C

ΔTavg = = 0.67 °C

ΔTunct == ±0.2°C

Observation Table: The qualitative observations taken during the experiment.

Figure 1: Concentration of Potassium Hydroxide vs the Change in Temperature.

Conclusion and Evaluation It is evident at the end of this experiment that the concentration has a significant effect on the change in temperature of water. The hypothesis that an increase in concentration of the Potassium Hydroxide would cause an increase in the change of temperature was proven correct. This is seen with regards to the data. A

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