Does anyone know how to answer these. This is my last lab for the class and I am

Question

Does anyone know how to answer these. This is my last lab for the class and I am completly stuck. We were not given any material and I have looked in my Inorganic Lecture Book as well as online. Any help would be great. Thankyou!

1) Predict the effect of adding PPH3 to a suspension of CuI in Ch2Cl2

2) When the resulting ‘diluted’ NaI solution is concentrated and re-used for a further preparation of CuI, the yield eventually might go (apparently) beyond 100%. Explain why (remember that the yield in the procedure as described moves around 90%).

Explanation / Answer

1. PPh3 forms complex with Cu

2. NaI being strong electrolyte, so due to comman ion effect equillibrium shifted to left resulting in more formation of CuI

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