Consider a solution containing. 100 M fluoride ions and. 126M hydrogen fluoride. The concentration of fluoride ions after the addition of 5.00 mL of. 0100 M HCl to 25.0 mL of this solution is ___M

Given:

Concentration of Fluoride ions = 0.100 M

Concentration of Hydrogen Fluoride = 0.126 M

Asked: Concentration of fluoride ions after the addition of 5ml of 0.0100 M HCl to 25 mL of the solution

Assume: 50:50 ratio of fluoride ions and HF

12.5ml*0.1mol/L * 1L/1000mL + 12.5*0.126mol/L * 1L/1000mL = 2.825x10^-3 moles F-

5ml * 0.01 mol/L * 1L/1000mL = 5x10^-5 moles

Assume: Volume additive

Final concentration = 2.825x10^-3 + 5x10^-5 moles / 30 ml * 1000ml/L = 0.0958 M