Exercise 1

StoichiometryChapter 10 Quantitative Analysis LabObjective: To produce a specific quantity of lead (II) chromate by thereaction of lead (II) nitrate with potassium chromate; and to demonstrate theLaw of Conservation of Matter and the stoichiometric relationship of thereaction.Procedure: (remember to record all measurements and observations in yourlab book`)1. Prelab calculationsa. Choose a number between 1.00 and 1.50. This is the number of gramsof lead (II) chromate you will try to make.b. Calculate the number of moles of lead chromate equal to your numberof grams.c. Calculate the number of moles of lead(II) nitrate required to give theabove number of moles of lead chromate.d. Calculate the number of grams of potassium chromate requiredto-give the above number of moles of lead (II) chromate?2. Lab - Day 1a. Carefully weigh out exactly the calculated amount of lead (II) nitrate.Dissolve in about 25 ml of distilled water in a 100 ml beaker. The exactamount of water is not critical since it will be removed by drying.b. In a 150 ml beaker carefully weigh the calculated amount ofpotassium chromate. Dissolve in about 25 ml of water. Again the exactamount of water is not critical to the reaction.c. Combine the two solutions to begin the reaction, being certain to rinseall of the solution from the beaker.d. Stir the reaction for 3-4 minutes to coagulate the precipitate.e. Filter the solution.10-18HC/CC/TG KHS