Question 1. If the column wasn’t rinsed adequately after regeneration of the resin would the calculated concentration of NaCl in the first sample analyzed be higher or lower than it should be? Why? 2. We did not standardize our titrant before we used it for this experiment. How would the calculated concentration of NaCl be affected (higher, lower, or no difference) if the titrant concentration was actually higher than what we thought it was? Why?
. These resins are organic
. Note that one H+ is released for each positive charge bound to the resin.
Since the resin exchanges a hydrogen ion for a sodium ion in this reaction, sulfonic acid resins are called cation-exchange resins. Equilibrium constants may be written for such reactions. For example, K= . For most cations the value of this K is large. Thus, the addition of a cationic material to the resin will displace an equivalent amount of H+ ions. If concentrated acid is added to a resin that is bound by metal ions, the equilibrium will shift to the left and the metal ions will be freed and the resin will return to the acid (H+) form. In this experiment, volumes of NaCl, Fe(NO3)3, and NaOH will be passed through a column packed with resin in the H+ form. The H+ released from the resin by each cation (Na+ and Fe3+) will be measured by titration with NaOH.
Question
1. If the column wasn’t rinsed adequately after regeneration of the resin would the calculated
concentration of NaCl in the first sample analyzed be higher or lower than it should be? Why?
2. We did not standardize our titrant before we used it for this experiment. How would the
calculated concentration of NaCl be affected (higher, lower, or no difference) if the titrant
concentration was actually higher than what we thought it was? Why?
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