CH111 Lab #3.docx - Procedure \u201cFor the procedure see lab manual(CH111 Lab Manual Winter 2020 pages 53-64 Wilfrid Laurier University Chemistry

CH111 Lab #3.docx - Procedure u201cFor the procedure see...

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Procedure “For the procedure, see lab manual (CH111 Lab Manual, Winter 2020) pages 53-64 Wilfrid Laurier University Chemistry Department. Winter 2020. Molecular Weight Determination by Freezing Point Depression. Pages 27-37 in Chemistry 111 Lab Manual. Wilfrid Laurier University, ON, Canada.” “No deviations were made from the lab manual.” Observations and Results A.I. Acid-Base Equilibria Table 1: 2 CrO 4 2- (aq) + 2 H + (aq) Cr 2 O 7 2- (aq) + H 2 O (l) Added K 2 CrO 4 H 2 SO 4 NaOH H 2 SO 4 Volume (mL or drops) 3 mL 8 drops 11 drops 10 drops Qualitative Before - Liquid - Yellow - Translu cent - Clear - Colorle ss - Liquid - Clear - Liquid - Colourl ess - Clear - Colourless - liquid Qualitative During, After - orange - liquid - transluc ent - orange - liquid - translu cent - liquid - yellow - translu cent - darker yellow/light orange - liquid - translucent A.II. Weak Acid – Base Indicator Equilibria – Methyl Orange and Phenolphthalein Table 2: HIn (aq) + H 2 O (l) H 3 O + (aq) + In (aq) (In = Methyl Orange) Added Methyl Orange HCl NaOH HCl Volume (mL or drops) 1 drop 2 drops 4 drops 4 drops
Qualitative Before - orange - liquid - translucent - clear - colourle ss - liquid - clear - colourle ss - liquid - clear - colourle ss - liquid Qualitative During, After - light yellow/orange - translucent - pink/red - transluc ent - liquid - yellow - transluc ent - liquid - pink - transluc ent - liquid Predicted Number of Drops: 2 drops Actual Number of Drops: 4 drops A.II. Weak Acid – Base Indicator Equilibria – Methyl Orange and Phenolphthalein Table 3: HIn (aq) + H 2 O (l) H 3 O + (aq) + In (aq) (In = Phenolphthalein) Added Phenolphthalein HCl NaOH HCl Volume (mL or drops) 1 drop 2 drops 4 drops 8 drops Qualitative Before - clear - colourle ss - liquid - clear - colourle ss - liquid - clear - colourless - liquid - clear - colourle ss - liquid Qualitative During, After - clear - colourle ss - liquid - clear - colourle ss - liquid - dark pink/purple - translucent - liquid - clear - colourle ss - liquid Predicted Number of Drops: __2____ Actual Number of Drops: ___8_____ B: Complex Ion Equilibria – Temperature Dependence of Co(II) Complex Ions Table 4: Co(H 2 O) 6 2+ (aq) + 4 Cl (aq) CoCl 4 2− (aq) + 6 H 2 O (l) Added CoCl 2 Sample 1 HCl Hypothesis Test Sample 2 Hot Water Sample 2 Cold Water Volume (mL or drops) 3 mL 33 drops Add water 37 drops HCl 37 drops HCl Qualitative Before - dark purple - liquid - clear - liquid - clear - liquid - dark purple - liquid - dark purple - liquid
- translucent - colourless - colourless - translucent - translucent Qualitative During, After - light purple/dark blue - liquid - translucent - light purple/dark blue - liquid - translucent - light pink - liquid - translucent - dark blue/purple -

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