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Unformatted text preview: Aaron King 660556233 Section 1 Tuesday, February 26, 2008 P rediction of P roton T ransfer Reactions 1. Acetic Acid Original Red/Pink Blue/Green Acetic Acid No Change Yellow N H 4Cl No Change Slowly to Blue C D Purple Red/Pink Blue No Change Blue No Change No Change Slowly to Yellow No Change Purple NaHSO3 Yellow No Change Na 2S Purple Slightly Unknown A B A HCl B NaHCO3 C Na2CO3 D NaH 2PO4 According to the pre-lab calculations, N H 4Cl will react with NaHCO3 and Na2Co3. From these two solutions, Na2S will react with NaHCO3, but not Na2CO3. Therefore, Unknown B is NaHCO3 and Unknown C is Na2CO3. From the two solutions (HCl and NaH 2PO4) that did not react with N H 4Cl, NaHSO3 will react with HCl but not NaH 2PO4. Therefore, i t is concluded that Unknown A is HCl, and Unknown D is NaH 2PO4. 2. 3. One possible experimental error is the contamination of the wells. If there was something left in the wells, this could skew the results in pH. Also, during the formation of a gas, the gas could have drifted and slowly contaminated a nearby paper, causing the observer to believe that there was a reaction in the well. 4. By using acid-base table, and being aware how to manipulate Ka values, it is possible to predict unknowns. Each proton t ransfer with an acid and i ts conjugate base has a Ka value, which can be used to predict the Ka of the total reaction. Then by using the Ka values, it is easily possible to determine if a certain reaction occurs. ...
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