Consider a flask containing 50.00 mL of 0.0400 M hydrofluoric acid (HF). This is titratedwith a 0.0953 M potassium hydroxide solution from a burette.Given: Kp of F is 1.41 x 10-11.Determine the pH of the solution in the flask after 36.00 mL of the base has been added?You must show any reaction equation(s) that you may think are necessary.Determine the pH of the solution in the flask at the half-way point of the titration.

Given, Molarity of HF = 0.0400M Volume of HF = 50.00 mL Volume of KOH = 36.00 mL Molarity of KOH =…

Answered: Consider a flask containing 50.00 mL of…

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter12: Chemical Equilibrium

Section: Chapter Questions

Problem 12.67PAE: 12.67 Hydrofluoric acid is a weak acid used in the building industry to etch patterns into glass for...

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The following question is taken from a Chemistry Advanced Placement Examination and is used with the permission of the Educational Testing Service. Solve the following problem: MgF2(s)Mg2+(aq)+2F(aq) In a saturated solution of MgF2 at 18 C, the concentration of Mg2+ is 1.21103M . The equilibrium is represented by the preceding equation. (a) Write the expression for the solubility-product constant, Ksp, and calculate its value at 18 C. (b) Calculate the equilibrium concentration of Mg2+ in 1.000 L of saturated MgF2 solution at 18 C to which 0.100 mol of solid KF has been added. The KF dissolves completely. Assume the volume change is negligible. (c) Predict whether a precipitate of MgF2 will form when 100.0 mL of a 3.00103 -M solution of Mg(NO3)2 is mixed with 200.0 mL of a .2.00103 -M solution of NaF at 18 C. Show the calculations to support your prediction.. (d) At 27 C the concentration of Mg2+ in a saturated solution of MgF2 is 1.17103M . Is the dissolving of MgF2 in water all endothermic or an exothermic process? Give an explanation to support your conclusion.
12.67 Hydrofluoric acid is a weak acid used in the building industry to etch patterns into glass for elegant windows. Because it dissolves glass, it is the only inorganic acid that must be stored in plastic containers. A 0.1 M solution of HF has a pH of 2.1. Calculate [Hj0"| in this solution.

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