Calculate the pH of a solution formed by mixing 124.8 mL of 0.481 M KF and 130.7 mL of 0.084 M HClO3.
To calculate the pH of a solution formed by mixing KF and HClO3, we need to determine the concentration of H+ ions in the solution.
1. First, calculate the moles of KF and HClO3 using their respective concentrations and volumes:
Moles of KF = concentration of KF × volume of KF solution
Moles of HClO3 = concentration of HClO3 × volume of HClO3 solution
2. Next, determine which reactant, KF or HClO3, is the limiting reagent. The limiting reagent is the reactant that is completely consumed in the reaction. It determines the maximum amount of product that can be formed. To find the limiting reagent, compare the moles of KF and HClO3, and whichever reactant has fewer moles is the limiting reagent.
3. After identifying the limiting reagent, we can determine the moles of the other reactant that react completely. This is done by using the stoichiometric ratio between the limiting reagent and the other reactant.
4. Now, calculate the concentration of the excess reactant. This is done by subtracting the moles of the excess reactant that reacted completely from the initial moles of the excess reactant, and then dividing by the total volume of the solution.
5. Calculate the concentration of H+ ions in the solution. Since HClO3 is a strong acid, it completely ionizes in water, producing H+ ions. Therefore, the concentration of H+ ions is equal to the concentration of the excess HClO3.
6. Finally, calculate the pH using the formula: pH = -log[H+].
By following these steps, you should be able to calculate the pH of the solution.