#620 A hydrogel is composed of crosslinked

A hydrogel is composed of crosslinked - Chemistry

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Free Chegg Question

A hydrogel is composed of crosslinked polymer chains, which are highly water absorbent. The gels are mostly (mostly>90%) water.
Liesegang linc patterns are precipitation patterns that appear in a gel when a chemical reaction takes place when a diffusing chemical (reactant A) in a gel reaches a concentration that is just enough to react with the reactant B (already present and homogeneously distributed in the gel) to form a precipitate. This precipitate appears as a colored line in the gel. Once the precipitate forms, reactant A is consumed all - howerver, diffusion of A does not stop. A ions propagate deeper into the gel and form another line of the precipitate when the A concentration again reaches the threshold concentration, just enough to react with the reactant B.

2) at which temperature the line would appear at the same distance from the start, cut in 75 min?

2) at which temperature the line would appear at the same distance from the start but in 75 min?

(Assume that the reaction only occurs when the Cu2+ concentration reaches the threshold concentration, and no reaction occurs before this time. In reality, the formation of patterns can only be explained/modeled by more complex reaction-diffusion equations.)

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Free Chegg Answer 

Cu reaction with cro42- to form precipitate lines, which formed initially below the cu2+ sol as the limiting reagent is cu solution and the reaction progress the line shifts as the completion of Cu favors the formation of cucro4 ppt. And this reaction occurs at 25 degrees depth of the precipitation line formed is 3 meters.

As the line formed at 3 m depth and the reaction progress the line formation shifts.

The same precipitation line formed at 75 min time at 100-degree temp.

As the reaction occurs at 100-degree celsius at 0.05 M conc the reaction favors precipitation line forms at the same depth of initial formation at 3 m depth