Chemistry 103/113 Laboratory
	This Week
Answer Keys Gen Chem Lab Periodic Table	· Expt 6: Photochemical Blues (week 2) o Week 2 report due tomorrow
	Next Time
	· Expt 6: Photochemical Blues (week 3) · Quiz 4: Expts 4, 8
	Notes for Today
	Photochemical Blues (Week 2) · Overview: o Synthesize/purify K3Fe(C2O4)3^.3H2O (“Green Compound”) (Week 1) o Qualitative tests for K^+, Fe^3+, C2O4^2- (Week 2) o %Fe photoreduction assay (Weeks 2,3) o Make blueprints (Week 3) · Qualitative Tests of the Green Compound: o Precipitation tests for Fe^3+ and C2O4^2- o Flame test for K^+ § heat excites electrons to high E levels § as electrons drop back to lower E levels, photons of light are emitted § light color emitted is determined by element’s electron E level spacings color emitted depends on the element · Quantitative Analysis of the Green Compound for Mass %Fe^3+: o Today § Weigh green solid, dissolve, expose to light o Next Time § Collect and weigh the FeC2O4^.2H2O produced from green solid § Find moles FeC2O4^.2H2O produced § Find moles Fe^3+ present in the green solid § Find grams Fe^3+in the green solid · Safety Issues o Splash hazard. Goggles required. o Bunsen burner