Question

Caliometry Chemistry Lab:

1. Why would one want to stir water in the calorimeter throughout the reaction?

2. Suppose a 100g block of aluminum is heated from 298K to a final value of 375K. Determine the heat flow with respect to the block of metal. Show all calculations.

Answer 1

1. stirring of water in the calorimeter throughout the reaction is done so as to maintain uniform temperature throught out the solution. Since suring the recording of data, they may be little variation in temperature of solution that can casue fluctuation in reading, so continous stirring.

2. The heat flow is determined by following formula:

heat flow = mass of solid block x change in temperature x specific heat capacity of metal used

In this case mass of Al block = 100g; temperature change = 375 - 298 = 77K; and specific heat = 0.9J/gK (known)

Thus heat flow = 100 x 77 x 0.9 = 6930J