The sugar cubes were analyzed and found to contain a center of an insoluble subs

Question

The sugar cubes were analyzed and found to contain a center of an insoluble substance in the form of AX, Write a balanced solubility equation and the solubility product expression for the solubility equilibria of AX, . the solubility of the unknown compound was 0.533 g/L Calculate the K_sp from this and identify the substance from Table 16.2. (molar mass = 245.2 g/mole) After you have identified the solid, write the balanced solubility equation and the solubility product expression for the solid. Give the concentration, in molarity, of both ions in solution from the K_sp only. (Le. in water) Normally, the pH of a cup of coffee is 6.2. Will this pH increase or decrease the solubility of the compound? Explain by writing the solubility chemical equation and how (if) it will be shifted due to the pH of the coffee solution.

Explanation / Answer

Reaction:

AX2 (s) -----> A2+ (aq) + 2X- (aq)

Ksp = [A2+]*[X-]2

Given solubility = 0.533 g/L = 0.533/245.2 mol/L = 0.00217 mol/L

Ksp = [0.00217]*[0.00217*2]2 = 4.08*10-8 M3.

Give the table for identification and for solving rest of the parts.

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