exp7 - -3 ) 2 Mg 2+ + 2Na + ========= 2(RSO-3 ) 2 Na + + Mg...

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Introduction Objective: The objective of this experiment is to determine (ppm) sodium by using ion-exchange chromatography. Theory: Ion exchange can be defined as a reversible in which ion are exchanged between a liquid and a solid. When the resin is brought into contact with a solution of sodium chloride, exchange of ions take place. The exchange reaction can be represented by (RSO - 3 ) H + + Na + ====(RSO - 3 ) Na + + H + When the magnesium ion exchanged with the hydrogen form of the resin, two sulfate groups are involved in the exchange with each magnesium ion, and the reaction can be represented by 2(RSO - 3 ) H + + Mg 2+ ==== (RSO - 3 ) 2 Mg 2+ + 2H + in this experiment a solution of the sodium salt, free from all other cation, is passed through a strongly acidic cation exchange resin, in the magnesium form as follow (RSO - 3 ) 2 Mg 2+ + 2Na + ===== 2(RSO - 3 ) 2 Na + + Mg + 1 ( 29 10 1000 23 V(ml) 0.05 2 mass × × × × =
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Calculation & Results: - Unknown # 3 From the following reaction (RSO
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Unformatted text preview: -3 ) 2 Mg 2+ + 2Na + ========= 2(RSO-3 ) 2 Na + + Mg + Number of moles of Na = 2* number of moles of Mg At the equivalence point Moles of analyte = moles of titrant Moles of analyte (Mg) = 0.05 M * V (ml) EDTA Substituting for Mg Number of moles of Na = 2 * 0.05 M * V (ml) EDTA Weight of Na (mg) per 10 ml of unknown Number of mg of Na = 2 * 0.05 M * V (ml) EDTA * MW Na Weight of Na (mg) for 1 liter of unknown (ppm) Na = 2 * 0.05 M * V (ml) EDTA * MW Na * 1000ml / 10 ml MW Na = 22.99 g/mole After titration V (ml) EDTA = (15-26) ml =11 ml (ppm) Na = 2 * 0.05 M * 11 ml * 22.99 g/mole * 1000ml / 10 ml (ppm) Na = 2530 ppm 2 CONCLUSION: -From this experiment we learned the use of ion exchange resins in column chromatography and its use in quantitative analysis. After running the experiment we found that the concentration of sodium in the unknown sample is equal to 2530 ppm. 3...
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exp7 - -3 ) 2 Mg 2+ + 2Na + ========= 2(RSO-3 ) 2 Na + + Mg...

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