Please show the solutions step by step

1. The equilibrium constant for the distribution of a very weak organic acid between ether and water is 1,5. 100 ml aqueous solution of the acid was extracted (shaken to equilibrium) repeatedly with 25 ml ether each time. After each extraction step, the two phases were separated. Calculate the minimum number of extraction steps required for less than 10% of the organic acid to remain in the aqueous phase.

2. The partition equilibrium constant for the extraction of anisole (C6H5OCH3) from water into an organic solvent is 27 at room temperature.

C6H5OCH3(aq) <-> C6H5OCH3(org)

An aqueous solution contains 100 mg of anisole per liter. What is the minimum volume ratio one must have in an extraction (in one step) to reduce the concentration of anisole in the aqueous solution to 1 mg per liter?

3. Determine the degree of dissociation in the following two cases:

a) 1 g of CuCl is added to 1 liter of water

b) 50 mg CuCl is added to 1 liter of water

The equilibrium constant for the equilibrium CuCl(s) Cu+ + Cl- is 10^-6,73 M^2