Planning And Design Ms Jackmon.docx

Joshua Riley DATE: 30/11.18 PROBLEM STATEMENT: Your grandmother has to do a barium metal test to locate and diagnose stomach ulcers. She is hesitant to swallow the suspension of Barium Sulphate because Barium compounds are poisonous. However, the doctor told her although Barium is toxic, Barium Sulphate can be used in the body. Suggest a hypothesis for the doctor’s statement and plan and design a lab to test the hypothesis. HYPOTHESIS: Barium sulphate is less soluble than Calcium sulphate AIM: to compare the solubility of barium sulphate to that of calcium sulphate. APPARATUS: (4) 100cm3 beakers, glass stirring rod, measuring cylinder, funnel, electronic balance. MATERIALS: 20cm3 1M NaSO4, 20cm3 1M BaNO3, 20cm3 1M NaSO4, 20cm3 1M CaNO3, (2) sheets of filter paper. DIAGRAM:

Fig 1: Set up for experiment METHOD: 1. Using the measuring cylinder, measure and pour 15cm3 of 1M NaSO4 in a beaker. 2. Rinse the measuring cylinder then measure and pour 15cm3 of 1M BaNO3 into the same beaker.

Joshua Riley 3. 4. 5. 6.

Filter the precipitate using filter paper, the funnel and a beaker. Measure the mass of a dry sheet of filter paper. Measure the mass of the precipitate and filter paper using the electronic balance. Repeat steps: (1) to (5) using NaSO4 and CaNO3.

VARIABLES: Controlled: Volume of reactants, concentration of reactants. Manipulated: Reactants. Responding: Mass of precipitate. EXPECTED RESULTS: The mass of the precipitate of BaSO4 would be greater than that of the mass of the precipitate of CaSO4. TREATMENT OF RESULTS: If the mass of the precipitate of BaSO4 is greater than that of the mass of the precipitate of CaSO4 then the hypothesis is correct. If the mass of the precipitate of BaSO4 is not greater than that of the mass of the precipitate of CaSO4 then the hypothesis is not correct. SOURCES OF ERROR: The use of impure reactants ASSUMPTION: Mass of water in filter paper is negligible LIMITATIONS: The mass of the precipitate without water.