This relationship is shown in the balanced equation of the reaction that

This relationship is shown in the balanced equation

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ions liberated and the number of sulfonic acid groups required on the resin to be held. This relationship is shown in the balanced equation of the reaction that happened in the experiment: + ¿ 2 + ¿ ( RSO 3 ) 2 Cu + 2 H ¿ + ¿ + Cu ¿ ¿ H ¿ 2 R SO 3 ¿ 1
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The negative charges of the active groups are always balanced by the positive ions it attracts, either the H+ ions or the cations from the analyzed solution, making the resin as a whole, electrically neutral. Because an exchange resin can take up amounts of solute and solvent, it is subject to swelling due to the osmotic effect. The osmotic effect results from the difference in solute concentration between the resin and the solution passed through the column. Because the solute concentration is higher in the pores of the resin, the solution tends to enter the resin and causes the swelling. This swelling controlled by the skeleton of the resin (the neighboring chains which makes up its 3D structure) using elastic forces. At equilibrium, these elastic forces are equal to the osmotic pressure, which may be more than 1000 atm. In the experiment, the resin was first soaked in water prior to preparing the ion-exchange column to lessen its concentration and more solute from the concentrated acid which would be added later would enter its pores. Resins are made of polymers with high molecular weight so it would not dissolve in water. The resin was soaked in concentrated acid in order to regenerate it with H + ions needed to facilitate the ion-exchange. However, HNO 3 is not advisable to use for this purpose as it causes significant gas evolution by oxidation, which may in effect eject the resin explosively from the burette and impair the efficiency of the column. In relation to that, the liquid level of the ion-exchange is kept above the resin level so as to prevent air pockets to form and remain inside the column, otherwise, the air pockets will cause an uneven flow and poor efficiency of ion-exchange. It may also hinder in the interaction of the solution
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  • Fall '17
  • Sir Jaden Smith
  • Chemistry, Atom, Ion Exchange Chromatography, Electric charge, Ion, Ion Exchange

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