Before you begin this experiment you should have a clear understanding of the following concepts. Why is it crucial to make your observations in a closed system , and what are the elements of the closed system in this experiment. It is useful, indeed preferred, that the results of this experiment be collected from as large a sample of experiments as possible. For example, in a class of 30 students, working in pairs it would be possible to combine fifteen data sets from which both the standard deviation and the probable error could be calculated. Procedure Put about 10ml of potassium iodide solution into a flask.
Half fill the test tube with the lead nitrate solution.
Stopper the flask tightly. Determine the mass of the flask and its contents accurately. Invert the flask so that the two solutions can mix. Re-measure the mass of the flask and its contents after the two solutions have mixed. Write a word equation and the chemical equation for this reaction.