Chemistry Lab On Hess Law Essay

Data table

Row data

Qualitative data
Table no.1 – the table showing the observation of the substances
Substance Observation Inference
3.00 mol dm-3 HCl Transparent
Smells
3.00 mol dm-3 NaOH Transparent
Smells
3.00 mol dm-3 CH3COOH Transparent
Smells
3.00 mol dm-3 NH3 Transparent
Smells
3.00 mol dm-3 HCl added to 3.00 mol dm-3 NaOH Transparent
Smells the heat releases, can feel the heat from the calorimeter
exothermic reaction
temperature rising
3.00 mol dm-3 CH3COOH added to 3.00 mol dm-3 NaOH Transparent
Smells the heat releases, can feel the heat from the calorimeter
most exothermic reaction
temperature rising
3.00 mol dm-3 CH3COOH added to 3.00 mol dm-3 NH3 Transparent
Smells the heat releases, can feel the heat from the calorimeter Fumes are given out
least exothermic reaction  
temperature rising

Quantitative data
Table no.2 – the table showing the volume of the substance used in the experiment
Substance Volume(cm3) (±0.01cm3)
3.00 mol dm-3 HCl 50
3.00 mol dm-3 NaOH 50
3.00 mol dm-3 CH3COOH 50
3.00 mol dm-3 NH3 50

Table no.3 – the table showing the specific heat capacity of substances
Substance Specific Heat Capacity (J g-1 k-1)
Water 4.18

Table no.4 – the table showing the data taken during the experiment
Time taken(secs) HCl (aq) + NaOH(aq) CH3COOH (aq) + NaOH (aq) CH3COOH (aq)   ¬NH3 (aq)
Initial temperature °C (±0.1°C) 19.0 19.0 19.2
Temperature after 30 secs °C (±0.1°C) 28.5 34.5 25.8
Temperature after 60 secs °C (±0.1°C) 28.6 34.3 25.7
Temperature after 90 secs °C (±0.1°C) 28.4 34.2 25.5
Temperature after 120 secs °C (±0.1°C) 28.3 33.9 25.3
Temperature after 150 secs °C (±0.1°C) 28.2 33.7 25.1
Temperature after 180 secs °C (±0.1°C) 28.0 33.6 24.8
Temperature after 210 secs °C (±0.1°C) 27.9 33.5 24.6
Temperature after 240 secs °C (±0.1°C) 27.8 33.3 24.4
Temperature after 270 secs °C (±0.1°C) 27.7 33.2 24.3
Temperature after 300 secs °C (±0.1°C) 27.5 33.1 24.2

Processed data
Table...