Copy of Lab 11: Le Châtelier’s Principle

Copy of Lab 11: Le Châtelier’s Principle - Wagwan fam Le...

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Wagwan fam Le Châtelier’s Principle Ms. Bareggi SCH4U Qasim Rashid 04/12/2018 Purpose: to study the effect of various stressors on an equilibrium system
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Materials: Test tube rack 4 small test tubes 0.10 mol/L K 2 Cr 2 O 7 0.10 mol/L K 2 CrO 3 0.10 mol/L HNO 3 0.10 mol/L KOH 0.10 mol/L Ba(NO 3 ) 2 0.10 mol/L K 2 Cr 2 O 7 Hypothesis: H 3 O (aq) + CrO 4 H 2 O (l) +Cr 2 O 7 2- (aq) (yellow) (orange) Addition of HNO 3 to chromate will cause the equilibrium to shift towards the products side. Addition of HNO 3 to dichromate will cause the equilibrium to shift towards the products side. Procedure: See reference sheet Observations: Part A: Chromate Dichromate Steps 1-5 Nitric Acid turns orange no change Potassium Hydroxide no change in colour turns yellow Steps 6-10 Potassium Hydroxide no change in colour turns yellow Nitric Acid turns orange no change in colour Part B: Chromate Dichromate Steps 1-3
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Barium Nitrate no change in colour, cloudy turns yellow Steps 4-6 Potassium hydroxide turns yellow Barium nitrate turns yellow, cloudy
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  • Fall '19
  • Hydronium, Yellow, Hydroxide

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