Two weak acids, ha and hb, have ka values of 1.0 x 10-6 and 3.0 x 10~4, respectively. their partition coefficients between water and ether are 12.2 for ha and 8.3 for hb. how many extractions are required (using vether/vwater-1) for the removal of ha ( 99%) from an aqueous solution, while retaining hb 2 99%) in the aqueous solution hint: for a general weak acid ha, only the protonated form (ha) is soluble in ether where as both the protonated and deprotonated (a-) forms are soluble in water. the distribution ratic tio (d) in this case is defined as: total concentration in ether[hal total concentration in water [ha] + [a- ether ? ? use this equation to derive an expression for dha in terms of k - halether/[ha], ka and [h+] (note an analogous expression for dhb). using the expression for dhb and the separation criteria for hb determine the ph for which the criteria for hb is satisfied and determine dha at this ph. note also that the fraction of ha remaining in water (q) for a single extraction is given by: water