LECHATELIER'S PRINCIPLE IN ACTION.docx

LECHATELIER'S PRINCIPLE IN ACTION.docx

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Oct 9th 2015 LE CHATELIER’S PRINCIPLE IN ACTION Celine Yu Equilibrium Lab1 Chem 12, Blk 4 PURPOSE: To study the stress which can disturb an equilibrium system by using the effect of concentration changes and the effect of temperature changes. PREDICTION: Refer to data tables. MATERIALS: Refer to lab #1 handout. PROCEDURE: Refer to lab #1 handout. RESULTS: Table #1: System #1: Thymol Blue Equilibrium Equation (including colours) H 2 Tb HTb - + H + Tb 2- + H + Red (orange) yellow (green) blue Stress Prediction of Shift Observed Change (Start /Finish Colour) Direction of Shift 1. Add HCl (↑[H + ]) L Yellow → red L 2. Add NaOH (↓ [H + ]) R Yellow → blue R 3. Add NaOH to HCl R Red → yellow R 4. Add HCl to NaOH R Blue → yellow L Table #2: System #2: Iron (III) and thiocyanate Equilibrium Equation (including colours) Fe 3+ (aq) + SCN - (aq) ↔ FeSCN 2+ (aq) + heat yellow colourless red-orange Stress Prediction of Shift Observed Change (Start /Finish Colour) Direction of Shift 1. Add Fe(NO 3 ) 3 R Pale orange → red-orange R 2. Add add KSCN R Orange → red-orange R 3. Add NaOH L Orange → pale yellow L 4. Raise temperature L Red-orange → colourless L 5. Lower temperature R Red-orange → darker red-orange R Table #3: System #3: Cobalt chloride complexes
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