To find the shc of water by the method of mixtures

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Presentation transcript:

To find the shc of water by the method of mixtures

Place some copper rivets in a boiling tube Place some copper rivets in a boiling tube. Fill a beaker with water and place the boiling tube in it. Heat the beaker until the water boils. Allow boiling for a further five minutes to ensure that the copper pieces are 100° C. Find the mass of the copper calorimeter. Fill the calorimeter, one quarter full with cold water. Find the combined mass of the calorimeter and water. Hence the mass of the water. Record the initial temperature of the calorimeter plus water. Quickly add the hot copper rivets to the calorimeter, without splashing. Stir the water and record the highest temperature. Find the fall in temperature of the copper rivets is and the rise in temperature of the calorimeter plus water.. Find the mass of the calorimeter plus water plus copper rivets and hence find the mass of the rivets.

Results Mass of the calorimeter = Mass of the calorimeter plus the water = Mass of the water = Initial temperature of water = Initial temperature of rivets 100° C Initial temperature of calorimeter = Final temperature of water = Final temperature of rivets = Rise in temperature of water = Rise in temperature of calorimeter = Fall in temperature of rivets = Mass of calorimeter plus water plus rivets = Mass of rivets = Calculations Energy lost by copper rivets = energy gained by copper calorimeter + the energy gained by the water mcccΔT = mwcwΔT + mcalccΔT.

Precautions Use a thermometer with a low specific heat capacity. Use enough copper rivets to produce a measurable temperature rise.