General Chemistry II Laboratory Manual, 2019 Revision 91 Part 3-Study of How Stressing a Second Equilibrium Can Affect an Equilibrium: Kuon e Bdwo;, - Banoy +KNDZ Ba2+ + CrO42- = BaCrO4 S 2CRO4²-+ 2H* = C2O7} + H2O 2. Color of BaCrO4 precipitate: yelow onr Observations: A! test tubes have a yellerw sUumo and preciptate remainmg at me buom. of Lbhu Explain what happens to both equilibria when acid is added. Haamg Ha lag,) to Bulrouo dissonved me precipitatte mno dissoved me bannim chrumate the Crou?-+oz0,?; SO Bainous) B dBsUlvca and than shifts equaron 2 to the nght. a rede oange erqurd." mi3 i3 becaus and convorted Explain what happens to both equilibria when base is added. Addmg base to ne second bannum Chromate shifrs me equamon oH-nn m ramere m mgnt. romere or Htfom equarron 2. mis causes me oang 20,2ion Mo turn yellew yeulerw t crouz- MB n racis wl Ba Part 4-Temperature Effect on an Equilibrium: Onto form me precupı coronofme the color oertRO 2NO2(g) = N204(g) Palerea. Bucsauics) AH=-57.1 kJ %3D Which tube has darker contents, the one in the ice bath or the one in the hot water bath? The nube mme hot wuien bum nas darize m me ne bat woa ig) manates more Mis Does heating this equilibrium cause it to shift to the right or to the left? Explain your answer. Heamg mis equilbnum to mer lest.Because me expesment is excmeimna, hedt acrs a product unll shift me Srele of me reactants. maci tme reac morsi Ane s imuallinba product; Inu reachon to me acts as a Remints H4 tam equal. gos buck to zerouz LIgnt yeuw) mm az Oq? General Chemistry II Laboratory Manual, 2019 Revision 85 5) Set up two more test tubes with the solutions you placed into the first two test tubes. Into these add about 15-20 drops of 6M sodium hydroxide solution. Note and explain any changes you observe on your data sheet. cinsay a 011/19)-2anocums. all iznshorurng-) Part 3-Študy of How a Second Equilibrium Can Affect an Equilibrium: Ba2+ + CrO4² Baarz)2 2CrO42-+ 2H* = Cr2O7²- + H2O と20U4 ー> BaCrO4l Kacnou -Rok Buwo3) 2に + sou 2- 1) Into a clean test tube, place about 2 mL of 0.5 M K2CRO4 solution. Now add about 5 drops of 1.0 M Ba(NO3)2 sOlution. Note the color of the precipitate on your data on. sheet. 2) Now add 15-20 drops of 6 M hydrochloric acid and mix well. Observe, record and explain what happens on your data sheet. Make sure you account for what happens in both equilibria listed above. 3) Finally, add 20-25 drops of 6 M sodium hydroxide solution and mix well. Observe, record and explain what happens on your data sheet. Make sure you account for what happens in both equilibria listed above. Part 4-Temperature Effect on an Equilibrium: uttc0z?し)れっuてl Og daiko 2NO2(g) = N2O4(g) AH = -57.1 kJ %3D Note: NO2 has a dark orange-brown color. N2O4 has a pale red-brown color. Your instructor will set up an ice bath and a hot water bath. Into each will be placed a sealed tube containing the equilibrium shown above. Note the appearance of each tube and explain what you observe on your data sheet. Part 5-Concentration and Temperature Effects on an Equilibrium: Co(H2O)62+ + 4Cl = Co(Cl),²- + 6H2O ,2- AH = ? Get three test tubes and a test tube rack. Into each of the three tubes, place about 3 mL of a CoCl2 solution. 2) The first test tube will be a control. Leave it as is. 3) Into the second test tube, add enough concentrated hydrochloric acid to observe a change. Note the change and also what you think happened on your data sheet. 4) Still in the second test tube, add enough deionized water until a change occurs. Note the change and what you think caused the change on your data sheet. 5) Take the third test tube and place it into a boiling water bath for 5-10 minutes. Compare the contents of the third test tube after heating to those of the control. Note the change on your data sheet. Based on your observations, decide whether this reaction is exothermic or endothermic and note this on your data sheet. o only har ăn mapact on equal ibmim NHy e-2 Nlyt (u wHy eL->