Thank you! Chemisty 152 Part II: Absorbance of initial solution (A Modern Experi

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Chemisty 152 Part II: Absorbance of initial solution (A Modern Experimental Chemistry 1 132 kc total acetic acid added de to constant colorof Acor HB- solution 5 2.03 4.00 mL Average Kell value: 3.32×10-5 I.I Questions: 1. Does the addition of KCI have a significant effect on absorption at max by BCG? Yes or no? 2. Based on the description of the effects of inert ions above, what effect on absorption would you expect if you replaced KCI with NaCI? 3. What effect on absorption would you expect if you substituted HCI for KC1? 4. Is Kc for BCG-Kargreater or smaller than Kc for BCG + 140? rerkr tan 5. If the calculated K,-0.99 for two solutions (I and II) of BCG, with solution II containing KCI, what does this tell you about the KCI concentration of solution I1?

Explanation / Answer

2. The lattice energy in KCl is much lower because of the larger size of the potassium ion. This increase in size means that the oppositely charged ions in KCl are further part than those in NaCl and therefore it takes less energy to break up the ionic bond in KCl. Thus, if we replace KCl with NaCl in the above case, less amount of NaCl would have been broken and thus, the concentrations would have decreased respectively of Na+ and Cl- ions in the equillibrium state.

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