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Investigating Chemical Equilibrium

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                                     Experiment 12A: Investigating Chemical Equilibrium                   Courtney.K

                                                                                                                       March.3rd, 2017

                                                                                                                Block 4

Purpose: As on page 163 “Essential experiments for chemistry” experiment 12A: Investigating chemical equilibrium.

Materials: As on page 164 “Essential experiments for chemistry” experiment 12A: Investigating chemical equilibrium.

Procedure: As on page 164-166 “Essential experiments for chemistry” experiment 12A: Investigating chemical equilibrium. Omit step 4.

Observations:

        Part 1: HBcg ←→ Bcg- + H+

Initial colour of bromcresol green in water: Blue

Reagent added

Stress

Colour change and number of drops added

Direction of equilibrium

HCl3

H+

Translucent Green, 1

More HCl3

H+

Translucent Yellow, 3

NaOH

OH-

Translucent Green, 2

More NaOH

OH-

Translucent Blue, 3

Part 2: Fe3+ (aq) + SCN-(aq) ←→ FeSCN 2+ (aq)

Reagent Added

Stress

Colour change and number of drops added

Direction of equilibrium

KSCN

KSCN

Opaque Dark Red, 10

FeCl3

FeCl

Translucent Red, 10

KCl

Spectator

Transparent Orange, 10

-

NaOH

OH-

Translucent yellow, 10

Part 3: Co(H2O)6 2+(aq) + 4Cl-(aq) ←→ CoCl4 2+ (aq) + 6H2O(l)

Colour of CoCl + HCl: Purple

Colour of CoCl2 + H2O: Pink

Stress

Colour Observation

Direction of Equilibrium

Step 4

HCl

 Translucent Pink

Step 5

Cl-

Translucent Blue

Step 6

Cl-

Transparent Pink

Part 5:

0.1M CuSO4

+3 Drops NH3

+ more NH3

1M HCl added

Appearance

Transparent

Same colour but was translucent

Solution went opaque with particles present

Fizzed, then went back to transparent

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