Final answer:
To determine whether a precipitate will form from the mixture of FeF2 and KOH, calculate the concentrations of the ions using the solubility product constant Ksp. By comparing the concentrations to Ksp, it can be determined that a precipitate of Fe(OH)2 will form.
Step-by-step explanation:
To determine whether or not a precipitate will be formed from the mixture of 500.0-mL of 0.001234 M FeF2 and 500.0-mL of 0.003142 M KOH at 25°C, we need to calculate the concentrations of Fe²+ and OH- ions. Using the equation Fe(OH)₂ (s) Fe²+ (aq) + 2OH(aq) and the solubility product constant Ksp = 4.87 × 10-¹7, we can plug in the concentrations to see if the Ksp is exceeded. By calculating the concentrations and comparing them to the Ksp, we find that a precipitate of Fe(OH)2 will indeed form from the mixture.