Calculate the solubility at 25°C of CuBr in pure water and in 0.30M NaCN .

Question

Calculate the solubility at 25°C of CuBr in pure water and in 0.30M NaCN . You'll probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits.

Calculate the solubility at 25°C of CuBr in pure water and in 0.30M NaCN . You'll probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits.

Answer 1

Find the K_sp for CuBr at in the data base

Let x be the molarity of Cu⁺ in solution at equilibrium (saturation)

Then x² = K and x = sqrt(K) The moles/liter can be converted to grams of CuBr/100 ml

I'm not sure what level this is, but the only way I see that the solubility of copper is affected would be the formation of the Cu(CN)₃^2- complex ion (You'd have to look for the K_f of the complex ion.

You'd then let x₁ stand for CuBr dissolved (in molarity) and x₂ be the amount of complex ion formed. Do an ice diagram to calculate Cu⁺, Br^-,complex, CN^- at equilibrium"

Cu⁺ x₁-x₂ Br^-: x₁ complex: x₂ and CN^-: .3 - 3x₂ Sodium is a spectator.

You have 2 equilibrium constants and 2 unknowns (x₁ is solubility in mol/liter)

Since I'm not sure if this is to the point, I'll stop here.