Question

How would your Calculated Value Of The Heat Of Solution Be Affected By The Following Mistakes ?

a. Spilling Some Salt On The Benchtop

While Transferring It To The Caliorimeter, And Being Unable To Sweep All Of It Up And Into The Calorimeter.

b. Having a Salt That Does Not Completely Dissolve In The Reaction Mixture.

c. Reducing the volume of liquid in the calorimeter to 80.0 mL, and correctly accounting for this in calculation.

Answer 1

Solution:

1) Spilling some salt on benchtop:

It causes less amount of salt is added in calorimeter which decreases the number of moles of salt. Therefore, calculated value of heat of solution will be lower than expected.

2) Salt not completely dissolved:

When the chosen salt is not completely dissolved, then the calculated value of heat of solution is lower than expected because change in temperature in calorimeter will be less than expected.

3) Volume is reduced:

If volume of liquid is reduced, then heat absorbed by liquid experiences high temperature change. Hence, heat of solution increases.