What color change do you observe after adding Na·EDTA solution to (17) A solutio
ID: 538139 • Letter: W
Question
What color change do you observe after adding Na·EDTA solution to (17) A solution to Well 8-2 (18) What is the initial color and appearance of the mixtures in Wells B-3 and B-4? If a precipitate is present, note that fact and the color of the precdpitate. Pinle (tot pink (19) What color change do you observe when you heat the mixture from Well B-3? NIA no change (20) What color change do you observe when you cool the pipet containing the heated mixture from Well B-4? 21) What color change do you observe when you cool the pipet containing the heated mixture from Well B-3 NIA 22) What color change do you observe when you heat the pipet containing the cooled mixture from Well B-4? (23) Write the net ionic equation for the eguilibrium involving Mg(OHD2 in this experimert.Explanation / Answer
(23) Ionic equation,
Mg2+ + EDTA^4- <==> [MgEDTA]2-
(24) Adding HCl shifts reaction towards left handside as more reactants is formed. this is according to Lechatellier's principle.
(25) the color change of the solution proves this prediction
(26) adding Na4EDTA shifts reaction towards right handside, as excess EDTA4- reacts with remaining Mg2+ to generate more products, accoding to LeChatellier's principle.
(27) change in color from initial and after addition proves this hypothesis.
(28) When heated the color changed due to formation of [MgEDTA]2- complex so forward reaction is endothermic in reaction.
(29) ionic equation,
Mg2+ + EDTA4- + heat ----> [MgEDTA]2-
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