HC,l1,0aaq)11+aq) + C2H302-(aq) System No. 1: Solutions 0.1 M HC2H,O2 pH Observa
ID: 1026541 • Letter: H
Question
HC,l1,0aaq)11+aq) + C2H302-(aq) System No. 1: Solutions 0.1 M HC2H,O2 pH Observation Clear dar L orange pape clear Tight erange pape 1. Did the equilibrium shift and in which direction? 2. How did the pH of the solution change after adding NaC,H,0, to it? (Hint: Identify which ion is being added to the solution and how it affects the concentration of other ions present in solution.) System No. 2: 2CrO42-(aq) + 2H+(aq)Cr,072-(aq) + H2On Solutions Na CrOs solution Na CrO, solution + HCI Na CrO, solution +NaOH 3. Explain how the equilibrium shifted when you added HCI to the solution? 4. Which chromium ion is orange and which is yellow? How did you know? Observations bligh ycllow orsan brighter clien How did the equilibrium shift when you added NaOH to the soluti ill react with and how that result will a on? (Hint: Think about what NaOH ffect the other components present in the solution.) Observations ions l mixed with water ture plus HC ture diluted with water Explain how the equilibrium shifted when you dissolved the BiCl, in excess Explain how the equilibrium shifted after the addition of HCI White whitt ane clon e equilibrium shifted after dilutionExplanation / Answer
4) The dichromate ion, Cr2O72- is orange while chromate ion, CrO42- shows yellow color.
If you add HCl to the solution then the equilibrium shifts towards right turning into orange color, hence
proving the presence of dichromate ion according to the equilibrium. Now if the solution is made basic
by adding NaOH the equilibrium will shift towards left, indicating a yellow color and the presence of chromate
ion.
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