Question

Buffers help

Peer-Assisted Reflection (PAR) Exercise Part 1 1. First, let's look at the properties of a solution of just a weak acid in water Must be completed (as a draft) before tutorial Scenario: You prepare a 0.200 M solution of an unknown weak acid HA and measure the pH at 25°C. The pH of your solution is unique. Every student in the class may have a different pH value . Take the date of your birthday, and divide by 100. Add 1.90 to determine your pH For example, ifyour birthday is on the 23rd of some month, the pH ofyour solution is 2.13 (a) Based on your unique pH, calculate the equilibrium concentration of [H3O+]E In your solution (b) Calculate the equilibrium concentrations of [A lE and [HAJE in your solution (c) Calculate the acid ionization constant Ka for your unknown weak acid HA 2. In Part 2 of this exercise, you will calculate the pH of your solution as you titrate with strong base. To help with these calculations, let's look at the progress of a generic weak acıd-strnig base titration Fill in the table on worksheet page 2, outlining features of a weak acid-strong base titration. Youll et feedback on this work at the tutorial, which will help you to make sure your calculationg in Part 2 focus on the right reactions! Part 2 You then titrate 40.0 mL of this solution of HA (aq) with a 0.300 M solution of the strong base, KOH (aq) Can be completed after tutorial For cach of the next 3questions, fırst copy the correct drawingfromyour table in Part Ionto yourworksheet, to show the major species fer neutralization at that stage of the titration. Then, complete the calculations based on the reactions of those major species with water 3. At the half-equivalence point of your titration... calculate the pH of your solution At the equivalence point of your titration... (a) Calculate the volume of KOH that must have been added to reach this point (b) Calculate the total solution volume (c) Calculate the pH of your solution at 25°C. 4. 5. When a totalof35.0mLofKOH(aqhas heen added toyourinitial solution ofHA, calculate the pH of your solution at 25°C. You are welcome to bring preliminary solutiong to the calculations in Part 2 a well for feedback in Tutorial, but these are not due until lab 5 Remember You must have a paper copy of your draft solution to Part 1 of your PAR with you at the start of your tutorial to receive participation credit for your work.

I only need help with part 2, however some information in part one might help! My unique pH is 2.00, [HA]=0.19M, [A-]=0.01M, [H3O+]=0.01M, and my ka is 5.263x10^-4 (at least I think this is right). Thanks!!

Answer 1