Using a paper punch, make two small holes in a plastic lid that fits tightly over the foam cups. Make one hole in the center and one oft the side. Retrieve the stirring wire and thermometer. With a ml graduated cylinder, measure out ml of distilled water into a clean, dry Simms beaker and heat on a hot plate to ICC-ICC by slowly raising the temperature. Stir with a glass rod occasionally to make sure the heating is uniform. Measure Some of cold distilled water and place in the calorimeter setup. As the water is heating, also monitor the temperature Of the cold water to find When it reaches equilibrium.
Record he temperature of the cold water to the nearest 0. ICC. When the water being heated reaches ICC-ICC, remove from the heat and let it sit on the lab bench, stirring occasionally. Record the temperature of the hot water to the nearest 0. CO. Quickly, remove the lid from the calorimeter and pour in the hot water. Replace the lid. Stir for 30 seconds, then begin monitoring the temperature of the combined water. Record the highest temperature reached in the calorimeter to the nearest 0. ICC. Calculate the calorimeter constant for your calorimeter.
Repeat the experiment twice more and use the mean value of the three determinations. Use the same calorimeter assembly as in Choice l. With a graduated cylinder, place ml into the calorimeter and cover with the hole-punched lid. Obtain an unknown metal block and record its identification code. Weigh it and record its mass to the nearest 0. Leg. Set up a mall beaker, halt tilled with distilled water, on a reinstating and heat to boiling& Record the temperature to the nearest C, OIC when it boils. Transfer the metal block into a clean, dry test tube and heat the test tube in the boiling water for at least ten minutes.
While the block is heating, monitor the temperature of the cold water to make sure it is constant. Record the temperature Of cold water to nearest O_ICC. Remove the cover Of the calorimeter and quickly transfer the metal block into the calorimeter. Cover and stir for 60 seconds. Record the highest temperature reached to the nearest C. ICC. Calculate the specific heat of the unknown metal. Repeat the experiment twice more and calculate the mean value from your three determinations for the specific heat Of the unknown metal. The same metal block may be used throughout the three trials.