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Lab Le Chatelier's Principle Lesson 4

Lab Le Chatelier's Principle Lesson 4. Part I. +. Thymol Blue ( blue ) + H + ⇌ Thymol Blue (yellow). OH -. HOH.  Na + + OH -. Add NaOH. Add HCl.  H + + Cl -. spectator. stress. stress. spectator. OH - lowers H +. Right. yellow.

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Lab Le Chatelier's Principle Lesson 4

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  1. Lab Le Chatelier's Principle Lesson 4

  2. Part I + Thymol Blue (blue) + H+ ⇌ Thymol Blue (yellow) OH- HOH  Na+ + OH- Add NaOH Add HCl  H+ + Cl- spectator stress stress spectator OH- lowers H+ Right yellow left blue

  3. Part II yellow orange Energy + 2CrO42- + 2H+ ⇌ Cr2O72- + H2O(l) + + Ba2+ OH- ⇌ ⇌ HOH BaCrO4(s)

  4. Part III yellowbrown Fe3+(aq) + SCN-(aq)⇌ FeSCN2+(aq) + 3OH- ⇌ Fe(OH)3(s)

  5. Part IV Co(H2O)62+ + 2Cl- ⇌Co(H2O)4Cl22- + 2H2O(l) pinkblue

  6. Part V light blue powder blue ppt Cu(H2O)42+ + 2NH3 ⇌ Cu(OH)2(s) + 2NH4+ + 2H2O + + 4NH3 H+ ⇌ ⇌ Cu(NH3)42+ violet NH4+ + 2OH-

  7. Energy + 2CrO42- + 2H+ ⇄ Cr2O72- + H2O(l) yellow orange AcidisH+ Base is OH- Acids react with bases H+ + OH-→ H2O(l) Stress Shift Add HCl right Add K2CrO4 right Add K2Cr2O7 left

  8. yelloworange 2CrO42- 2H+ Energy + + ⇄ Cr2O72- + H2O(l) + + Ba2+ OH- ⇌ ⇌ BaCrO4(s) HOH shifts right- all CrO42-changestoCr2O72- HCl 5 drops 6 M (lots!) Ba(NO3)2 noCrO42- -no reaction left- makes CrO42- NaOH yellow ppt

  9. 1. Explain the colour changes observed when Fe(NO3)3, KSCN, and NaOH were added to the thiocyanairon equilibrium system. Start by writing the equilibrium equation. Fe3+(aq) + SCN-(aq)⇄ Fe(SCN)2+(aq) yellow brown Adding Fe(NO3)3 increasesthe [Fe3+] and causes the reaction to shift right and turn brown. Adding KSCN increases the [SCN-] and causes the reaction to shift right and turn brown. Adding NaOH increasesthe [OH-] ,which reacts with Fe3+ , lowering the [Fe3+], , and turn yellow. causing the equilibrium to shift left

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