Chem_173B_HW1_2008_Key

Chem_173B_HW1_2008_Key - Chem 173B/268B Homework assignment...

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Unformatted text preview: Chem 173B/268B Homework assignment #1 Prof. S. Scott Answer key Total: 23 points 1. Predict the reactions of each of the following compounds with water (10 points; 1 point for each) (a) CaH 2 + 2 H 2 O o Ca(OH) 2 + 2 H 2 (can also write Ca 2+ + 2 OH- , but Ca(OH) 2 is sparingly soluble) (b) MgC 2 + 2 H 2 O o Mg(OH) 2 + C 2 H 2 (recall Mg(OH) 2 is sparingly soluble) (c) H 2 S + H 2 O o H 3 O + + HS- (d) CH 4 o no reaction (e) BaO 2 + 2 H 2 O o Ba 2+ + 2 OH- + H 2 O 2 (recall Ba(OH) 2 is very soluble) (f) KO 2 + H 2 O o K + + HO 2 /O 2- (pK a 4.7) (g) LiBr o Li + + Br- (h) Al 2 O 3 o no reaction (i) NaN 3 o Na + + N 3- (j) NH 3 + H 2 O o NH 4 + + OH- 2. AlF 3 is insoluble in liquid HF, but dissolves if NaF is present. When BF 3 is added to the solution, AlF 3 precipitates. Explain these observations in terms of the nature of the reactions occurring at each step.(2 points) in the presence of NaF, AlF 3 (insoluble) + 3 NaF o 3 Na + + AlF 6 3- (soluble)(1 point) upon addition of BF 3 , AlF 6...
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This note was uploaded on 08/06/2008 for the course CHEM 173B taught by Professor Scott during the Winter '08 term at UCSB.

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Chem_173B_HW1_2008_Key - Chem 173B/268B Homework assignment...

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