Question

if you mix 1.2 ml of 2.000 m fe3 with 1.2 ml of 0.000869 m scn-, what is the concentration of fescn2 at equilibrium?

Answer 1

Without the equilibrium constant Kc, the exact equilibrium concentration of FeSCN2+ cannot be calculated from the initial concentrations of Fe3+ and SCN-. However, if we assume all SCN- reacts, the concentration would be equal to the initial SCN- concentration.

Step-by-step explanation:

To calculate the equilibrium concentration of FeSCN2+ when 1.2 mL of 2.000 M Fe3+ is mixed with 1.2 mL of 0.000869 M SCN-, one must presume the reaction goes to completion due to the large excess of Fe3+. However, we would need the equilibrium constant, Kc, to calculate the exact concentration at equilibrium. In general, the concentration can be found using the initial concentrations and change in concentration of reactants and products (using an ICE table - Initial, Change, Equilibrium). Without the Kc value or additional context provided, an accurate equilibrium concentration cannot be provided. However, if we assume that all SCN- reacts completely to form FeSCN2+, then the concentration of FeSCN2+ at equilibrium would be the same as the initial concentration of SCN-, due to the volumes being equal and reaction stoichiometry being 1:1. But it is important to note that this assumption may not hold true in the real scenario where equilibrium is established.

Answer 2

The equilibrium concentration of FeSCN2+ cannot be calculated without additional information, specifically the equilibrium constant for the reaction between Fe3+ and SCN-.

Step-by-step explanation:

The question involves calculating the equilibrium concentration of FeSCN2+ when 1.2 mL of 2.000 M Fe3+ is mixed with 1.2 mL of 0.000869 M SCN-. To determine the equilibrium concentration, we must account for the fact that Fe3+ and SCN- will react to form FeSCN2+ until equilibrium is reached. Unfortunately, the question lacks enough information, specifically the equilibrium constant for the reaction (Kc or Keq), which is crucial to calculate the exact concentration at equilibrium. Without this data or additional context such as the extent of reaction or the equilibrium concentrations of the other species, it is not possible to give an accurate answer.