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Questions
Part 1
Write the reversible reaction for Part 1 (include colors)
Test tube __2____
Stress: _______________________________________________________________
How rxn tries to remove stress: _________________________________________________
Circle: Make more product or more reactant
Circle: Favoring: Forward rxn or Backward rxn
Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)
Solution turned: More Light Brown or More Red or No change
Compare to lab observation: __________________________________________
Test tube ___3___
Stress: _______________________________________________________________
How rxn tries to remove stress: _________________________________________________
Circle: Make more product or more reactant
Circle: Favoring: Forward rxn or Backward rxn
Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)
Solution turned: More Light Brown or More Red or No change
Compare to lab observation: __________________________________________
Test tube ___4___
Stress: _______________________________________________________________
How rxn tries to remove stress: _________________________________________________
Circle: Make more product or more reactant
Circle: Favoring: Forward rxn or Backward rxn
Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)
Solution turned: More Light Brown or More Red or No change
Compare to lab observation: __________________________________________
Part 2
Write the reversible reaction for Part 2 (include colors)
For this reaction you need to know a few more pieces of information.
1)HCl --> H+ (or H3O+) + Cl1-
So, in a bucket of HCl solution, there is no HCl but only H+ and Cl1- ions.
Therefore, adding HCl really means adding H+ (or H3O+)
2) NaOH ---> Na1+ + OH1-
Then the OH1- + H+ ---> H2O
Looking at the above two equation, one needs to realize that you can explain lab observations in two different ways with respect to LeChatlier's Principle.
2a) OH1- from the NaOH consumes H+ as in the above reaction so adding the chemical is actually a decrease in [H+] or
2b)OH1- from the NaOH reacts with H+ to form H2O so adding the chemical is actually increase [H2O].
So, for the reactions with NaOH below, please alternate explanation (once using 2a & another times using 2b).
Test tube ___5 (HCl added)___
Stress: _______________________________________________________________
How rxn tries to remove stress: _________________________________________________
Circle: Make more product or more reactant
Circle: Favoring: Forward rxn or Backward rxn
Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)
Solution turned: More Yellow or More Orange or No change
Compare to lab observation: __________________________________________
Test tube _6 (HCl added)_____
Stress: _______________________________________________________________
How rxn tries to remove stress: _________________________________________________
Circle: Make more product or more reactant
Circle: Favoring: Forward rxn or Backward rxn
Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)
Solution turned: More Yellow or More Orange or No change
Compare to lab observation: __________________________________________
Test tube ___6 (NaOH added)___
Stress: _______________________________________________________________
How rxn tries to remove stress: _________________________________________________
Circle: Make more product or more reactant
Circle: Favoring: Forward rxn or Backward rxn
Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)
Solution turned: More Yellow or More Orange or No change
Compare to lab observation: __________________________________________
Test tube __7 (NaOH added)____
Stress: _______________________________________________________________
How rxn tries to remove stress: _________________________________________________
Circle: Make more product or more reactant
Circle: Favoring: Forward rxn or Backward rxn
Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)
Solution turned: More Yellow or More Orange or No change
Compare to lab observation: __________________________________________
Test tube __8 (NaOH added)____
Stress: _______________________________________________________________
How rxn tries to remove stress: _________________________________________________
Circle: Make more product or more reactant
Circle: Favoring: Forward rxn or Backward rxn
Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)
Solution turned: More Yellow or More Orange or No change
Compare to lab observation: __________________________________________
Test tube __8 (HCl added)_____
Stress: _______________________________________________________________
How rxn tries to remove stress: _________________________________________________
Circle: Make more product or more reactant
Circle: Favoring: Forward rxn or Backward rxn
Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)
Solution turned: More Yellow or More Orange or No change
Compare to lab observation: __________________________________________