12 a Expriment
Name ___________________________________________ Date ___________________________________ Block ____
Experiment 12A Investigating chemical equilibrium
ABSTRACT 1. What is equilibrium and how can you tell it has been reached? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 2. What is a “stress” and how does it affect an equilibrium? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 3. What are the 4 objectives to this experiment? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________
MATERIALS AND PROCEDURE As per Essential Experiments for Chemistry pages 163–170
RESULTS TABLE 1 Equilibrium involving bromocresol green Initial colour of bromocresol green in water = Reagent added HCl (step 3) more HCl (step 4) NaOH (step 5) more NaOH (step 6) Stress Colour change and # of drops required Direction of shift
ver. 02/2012
1
Chemistry 12
Unit 2 Reaction Equilibrium
TABLE 2 Equilibrium involving iron(III) thiocyanate ion Colour of FeCl3
Experiment 12A Investigating chemical equilibrium
ABSTRACT 1. What is equilibrium and how can you tell it has been reached? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 2. What is a “stress” and how does it affect an equilibrium? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 3. What are the 4 objectives to this experiment? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________
MATERIALS AND PROCEDURE As per Essential Experiments for Chemistry pages 163–170
RESULTS TABLE 1 Equilibrium involving bromocresol green Initial colour of bromocresol green in water = Reagent added HCl (step 3) more HCl (step 4) NaOH (step 5) more NaOH (step 6) Stress Colour change and # of drops required Direction of shift
ver. 02/2012
1
Chemistry 12
Unit 2 Reaction Equilibrium
TABLE 2 Equilibrium involving iron(III) thiocyanate ion Colour of FeCl3