Question

Introduction to Equilibrium Lab report

Please help answering the question #2 (a,b,c,d)

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Question

Procedure

Notebook

Complex ion equilibrium 1. Formation of the complex ion: 38 a) What evidence was there that a new chemical substance had formed? b) How did the reaction change the initial iron and thiocyanate concentrations? Would the reacon av tken place ifthe proportions hadtbenhioneric raior? 2. Adding and removing reactants: a) What effecet did adding the reactants (Fe' or SCN-) have on he briumcmposition? evidence was there? How did NaOH remove a reactant? b) How did this affect the concentration of each component of the iron -thiocyanate equilibrium reaction? Fe: SCN: FeSCN2: Were each of the four test tubes still at equilibrium after the changes you made? c) Did each of the four test tubes have the same composition after the changes you made? d) C. Complex ion equilibrium I. Set up the equilibrium between ferric ion, thiocyanate ion, and the thiocyanatoiron Fe"(aq) + SCN' (aq) FeSCN"(aq) by combining stoichiometric amounts of ferric ion and thiocyanate ion: Combine cionized (.0ml%f0.02,M rrie nitrate, 2.0 mL of 0.01 M sodium thioeyanate (NaSCN) and about 25 mL of de a beaker Save the solution for step 2. CTQ I) What evidence of reaction is there? CTQ m) If you diluted it what would happen to the intensity of the co CTQ n) If FeSCN2 was partially removed, what would happen to the 2. Adding and removing reactants: Place-$mL of the solution from (1) in eac To the first add 5 drops of 0.02 M ferric nitrate, mix and watch the color. 2To the second similarly add 5 drops of 0.01 M NaSCN 3 To the third add 2 drops of 6 M NaOH After 3 or 4 minutes, compare the colors of each to the fourth test tube by p white background, compare each by Tyndall scattering, and record your ob o) After the other chemicals were added, are all the components of the equn Is an equilibrium still present? p) What evidence (color change? precipitate?) was there of specific changes in briunm reaction still present? equilibrium compositions? CTQ q) Does the equilibrium for this reaction exist at one set of concentrations or several sets of concentrations? Fe(OH)s is insoluble in water. Write a net ionic, equilibrium reaction in vour lab notebook showing the reaction between Fe'(aq) and OH (aq) . Add about LmL of IMnitric acid to the third test tube and record observations. Then clean out the third test tube, empty it into waste and then add about 1 mL of 1M'nitric acid to rinse and clean the test tube. CTQ r) By adding H+ to a solution that contains OH, what should happen to the amount of OH in the solution? CTQ s) What will then happen to the amount of Fe(OH)s (s) present? CTQ t) How does this use LeChatelier's principle to help with the cleaning? D. Acid base equilibrium: ahtholain solution toábout$0 mDof deionized water in a 125 ml. Erlenm Cbsevvedl chan cesw 4 Aceo SmL ta each fat tube (4) very small, prerprtaf m mill Color. Prpple Jute-colon , samecator fo 24th

Answer 1

given comple-X-TOY (a)Accorderu to Le-Chatalǐen's Pminciple , the,additom eadda of a reaciant on produet to a syatem in gudlbmung cauas the eguileitim to shift in the direction that deereane the. donerilration of the added Compohew wte.tore on addir14.ot ve.ae more product wiu form making the resultant solelbion apple juite colevor volich is ealoror of om apple juice colouon volich is eoloton of FeseN2"(ag). T± is evident-forn the expoumentN resulキan, woll. on additon of 5dropsofo,02(M) fe yrai e milhyat solution become dorkei in calotui. meaning mmore feseN SCN naつ .to Ym addition of Na OH, it uwill react fe3t (aa) lo form preeipitate of fe(or)a,rerno ving the ) On comeey to form Na seN olich is highliur soluble in I T Concentatim of seN- will not change On addilion of NaOH o e (aa) concentration dhains out, kenee aceordeng to te chatelio's paineiple equili bium sbit towards backiwand liie bye ereaseう。

e) Att the elanags e hade the prexioug (c) Aftin But a meo eguilibmium has formed tohote coneenlration of each speeies voil be diforen fom the preiou ome (d) The. compostion of the each of the fowr tlie test tube voill be diffotent than tthe prerious ome becaune we have. distwred the eguilibum by adding. difforent sptcier ,hence the eguilib um shifted touoand s such a divection to miimis thin digtbanee. As a nesult of speelen , uence the egui