Question

A careless scientist is about to measure the heat capacity of a calorimeter using the procedure described in this experiment. The scientist misreads the burette and dispenses 95.00 mL of water rather than the required 75.00 mL into the calorimeter. If the scientist presumes that the volume was 75 mL, what effect will this error have on the determination of the heat capacity (C_p)of the calorimeter?

a) The Calculated Cp will be too low.

b) (T₂ - T₁) will be different but C_p will be the same

c) The increased mass of water will prevent any difference

d) The calculated C_p will be too high

Answer 1

The answer is option (a)

It will give a reading which will be of lower heat capacity than the actual one. Allowing the reaction to take place and dispense heat into the calorimeter, there is 20 ml of water extra to absorb that will lower the heat capacity of the calorimeter as all the heat will be dissipated in absorbing that 20 ml extra water that the original heat capacity (Cp) will be lowered by a very large amount.

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