Question

How does the temperature change in the water correlate to the change in the reaction????????????????

	Trial 1	Trial 2
mass of baking powder (Na2cO3) added	3g	3g
mass of vinegar added	43.3 g	43.3 g
Final temperature, tf	19.3°C	19.3°C
Initial temperature, ti	21.2°C	21.2C
Change in temperature, ∆t	1.9°C	1.9°C
q (water) = mwCwTw	368.06648 J	368.06648 J
q(reaction)	- 368.06648 J	- 368.06648 J
moles of Na2CO3	0.02830 mol	0.02830 mol
ΔH (kJ/mol)	13.006 kj/mol	13.006 kj/mol

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Answer 1

As the observation table shows that on mixing both vinegar and baking soda, the temperature decreases since initial temperature is 21.2°C and final temperature is 19.3°C. The reaction in which decrease in temperature will takes place i.e. heat is absorbed by the reactants are known as endothermic reaction.

According to Lechatelier principle, increase in temperature of endothermic reaction will shift the reaction towards product side. Since, reaction between vinegar and baking soda is endothermic, thus on increasing temperature more product will form.

2 CH3COOH + Na₂CO₃    CO₂ + H₂O + 2 CH3COONa