Question

Determine how many mL of solution A(acetic acid-indicator solution) must be added to solution B (sodium acetate indicator solution) to obtain a buffer solution that is equimolar in acetate and acetic acid. You will need to refer to the Experimental Procedure, partcularly the section on calculations, to answer this question. Show all calculations.

of an indicator 2. Determine how many ml of solution A (acetic acid-indicator solution) must be added to solution B sodium acetate-indicator solution) to obtain a buffer solution that is equimolar (equal molar concentration) in acetate and acetic acid. You will need to refer to the Experi- mental Procedure, particularly the section on calculations, to answer this question. Show all calculations SO y na Calculate moles Ac in solution B. 0 3.0 V10 mxl - 1.000.me) 10.160 m) = 0.0052m Dioccolgron 00032 mol Ac 2.0 m oto rb. Calculate the molarity of HAc in solution A. sodium acciale 2 2 OmLxIL M HAC re c. Calculate volume of solution A needed when the moles of Ac equals moles of HAC SUA: 2 mor 3.0x104 giun Smil.com HA - ml soln A .Onu. 200 mk4 3. K is approximately 2 X 10 under your experimental conditions. Use Equation (5) to 1 - 0411 estimate the pH after the first addition of 1 ml. of solution A. Show all calculations a. Calculate p - PR b. Calculate moles HAc in the 1 ml of solution A added to solution B. mol HAC c. Calculate moles Ac in solution B. mol Ac d. Rearrange Equation (5) to solve for pH. pH

Answer 1

b) (HAC) in solution A mnoles HAC Total volume 2 1.60m x S-omL soomi 2 0-160 M HAC moles of HAC 2 moles of te in solutno {mou) x Solna a 0.00032 moles 0-160 ml v 2 0 -00032 moles 0.0020 L x Lomi 2-0 ml HAC volume of solurn . needed 2 20 ml