The solubility of cd(oh)2 can be increased through formation of the complex ion cdbr2−4 (kf=5×103). if solid cd(oh)2 is added to a nabr solution, what would the initial concentration of nabr need to be in order to increase the molar solubility of cd(oh)2 to 1.0×10−3 moles per liter?

Concentration of sodium bromide required = 2.38 M (around 2.4 M)

Explanation:

The equilibrium representing the complex ion formation is:

-----(1)

where K(f) = formation equilibrium

The equilibrium representing the dissolution of Ca(OH)2 is:

---(2)

where Ksp = solubility product

adding Equation (1)  and equation(2) gives the net reaction:

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