Experiment 12

Planning and Designing

Problem Statement :
You are given a sample of FA3 which contains the cations Cu 2+ , Pb 2+ and Fe 3+ 
along with nitric acid , hydrochloric acid , sulphuric acid , aqueous ammonia 
and sodium hydroxide . Design an experiment for obtaining reasonably pure samples
of the hydroxide of each of the cations present .

Expected observations are to be clearly stated .

Criteria    : PLANNING & DESIGNING ;

Planning and Designing 12 mks


MARK SCHEME
Statement of Hypothesis			2 mks
Aim						1 mk
Apparatus & Material			3 mks
Method					4 mks
	Logical sequence
	Language
	Steps
	Tense
Variables					2 mks
Data						3 mks
	All data
	Missing 1 essential
	Missing 2 or more essential
Predicted Results				2mks
Limitations / Assumptions / 		3 mks
Sources of Errors