a. formula of the solid cobalt chloride salt b. what things , including complexe

Question

a. formula of the solid cobalt chloride salt b. what things , including complexes exist in solution when cobalt chloride is dissolved in water? in ethanol? c. Why does Cu^2+ molarity decrease when ammonia is added to it? d. What is the main thing in solution at that point, using the formation constant for the copper ammonia complex to answer this. e. which molecule will increase in concentration when the pressure is increased in the nitrogen dioxide-dinitrogen tetroxide? Do not answer right or left or reactants or products. Be specific

Explanation / Answer

a) CoCl2.6H2O

b) water: Cl-, [Co(H2O)6]2+ (main product), [CoCl4]2- (in a really small proportion)

c) Cu2+ + 2 NH3 + 2 H2O --> Cu(OH)2 + 2 NH4+ Cu(OH)2 precipitates, diminishing Cu2+ concentration.

d) Considering the K of the Cu(NH3)42+ complex (K = 2.1 x 1013) and the low Kb of NH3 (1.8x10-5) The main species is the Cu(NH3)42+ complex.

e) 2NO2 <--------> N2O4

Following the Le Chatelier’s Principle, if the pressure is increased, the number of moles of gases must be reduced. There are two moles in reactants and one mole of product (N2O4). In order to reduce moles more N2O4 must be produced. That means N2O4 will increase.

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