(a) A 6-coordinate complex may be obtained by
crystallizing anhydrous Cal2 from THF solution at 253 K. In contrast, when anhydrous Bal2 is crystallized from THF at 253 K, a 7-coordinate complex is isolated. Suggest structures for the two complexes, and commcnt on possible isomerism and factors that may favour one particular isomer in each case. Rationalize why Cal2 and Bal2 form complexes with THF that have different coordination numbers.
(b) Which of the following compounds are sparingly soluble in water, which are soluble without reaction, and which react with water: BaS04, CaO, MgCO3, Mg(OH)2, SrH2, BeCl2, Mg(C104)2, CaF2, BaCl2, Ca(NO3)2? For the compounds that react with water, what are the products formed?
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