lab 19a flowchart and hypothesis
Chemistry 12 - Lab 19A Flow Chart (Investigating Chemical Equilibrium)
PART 1:
Put on safety goggles and lab apron
Obtain 2 (Empty, Clean, AND DRY) 250mL Erlenmeyer flasks.
Add approx. 100mL of DISTILLED water and 1mL of thymol blue solution to each flask
Record the colour of this solution in note book
FIRST FLASK: add a single drop of 0.1M HCl.
Swirl the contents of the flask and continue drop-by-drop addition until a definite colour change is observed.
SECOND FLASK: will serve as a control.
COMPARE the solution colours
Record the new colour and the number of drops required for the change to take place in Table 1.
Continue the drop-by-drop addition of 0.1M HCl to the first flask until a second colour change occurs.
COMPARE with the control (Flask 2)
Record the new colour change AND number of drops required for this change in Table 1.
NOW add 0.1M NaOH, drop by drop in the first flask until a definite colour change is observed.
Record the colour change and number of drops required into Table 1.
Continue the drop-by-drop addition of 0.1M NaOH until the colour changes again.
Record the colour change and number of drops required in Table 1.
PART 2:
Place 1mL of 0.2M FeCl₃ into a 250mL beaker.
Using a Graduated Cylinder, measure a 1mL portion of 0.2M KSCN
Record the colour of each solution in notebook!
ADD the measured portion of 0.2M KSCN soloution to the beaker containing the 0.2M FeCl₃
Swirl the mixture
Record the colour in notebook
ADD enough distilled water to the solution to dilute the intense colour to a light amber colour. (Approx. 80mL)
POUR 5mL of this solution into 5 seperate test tubes labeled A-E.
TEST TUBE ‘A’ SERVES AS A CONTROL!!
For the reactions that will occur during steps 5-8; copy results into Table 2:
Record the “stress” involved, state which ion in the ORIGINAL EQUILIBRIUM changed concentration, and whether the change was an increase or a decrease.
TEST TUBE B: add 10 drops of 0.2M KCL
TEST TUBE
PART 1:
Put on safety goggles and lab apron
Obtain 2 (Empty, Clean, AND DRY) 250mL Erlenmeyer flasks.
Add approx. 100mL of DISTILLED water and 1mL of thymol blue solution to each flask
Record the colour of this solution in note book
FIRST FLASK: add a single drop of 0.1M HCl.
Swirl the contents of the flask and continue drop-by-drop addition until a definite colour change is observed.
SECOND FLASK: will serve as a control.
COMPARE the solution colours
Record the new colour and the number of drops required for the change to take place in Table 1.
Continue the drop-by-drop addition of 0.1M HCl to the first flask until a second colour change occurs.
COMPARE with the control (Flask 2)
Record the new colour change AND number of drops required for this change in Table 1.
NOW add 0.1M NaOH, drop by drop in the first flask until a definite colour change is observed.
Record the colour change and number of drops required into Table 1.
Continue the drop-by-drop addition of 0.1M NaOH until the colour changes again.
Record the colour change and number of drops required in Table 1.
PART 2:
Place 1mL of 0.2M FeCl₃ into a 250mL beaker.
Using a Graduated Cylinder, measure a 1mL portion of 0.2M KSCN
Record the colour of each solution in notebook!
ADD the measured portion of 0.2M KSCN soloution to the beaker containing the 0.2M FeCl₃
Swirl the mixture
Record the colour in notebook
ADD enough distilled water to the solution to dilute the intense colour to a light amber colour. (Approx. 80mL)
POUR 5mL of this solution into 5 seperate test tubes labeled A-E.
TEST TUBE ‘A’ SERVES AS A CONTROL!!
For the reactions that will occur during steps 5-8; copy results into Table 2:
Record the “stress” involved, state which ion in the ORIGINAL EQUILIBRIUM changed concentration, and whether the change was an increase or a decrease.
TEST TUBE B: add 10 drops of 0.2M KCL
TEST TUBE