Hello, I am trying to prepare a buffer from a solution of a weak acid. This is f

ID: 992316 • Letter: H

Question

Hello, I am trying to prepare a buffer from a solution of a weak acid.

This is for part D. of Experiment 25 - Ph Measurements - buffers and their properties

I am to be give an 0.50 M solution of weak acid with a given pKa, and I will preparre a buffer of a desired pH measurement (choose any pH)

I must first dilute the acid solution to 0.10 M by adding 10 ml of the acid to 40 ml of water.

Then calculate how much 0.10 M NaOH I must add to 20 ml of the acid.

I am having difficulty setting up my equation for this lab

D. Preparing a Buffer from a solution of a weak acid.

pH of buffer to be prepared: ___ (select pH), pKa of acid: ___ will be provided(select hypothetical)

Ratio of [B-]/[HB] required in buffer: ___

Volume of 0.10 M NaOH to be calculated ___ ml

pH of acid before titration:___

Initial volume reading of NaOH:___ml

Final volume reading of NaOH:__ml

Volume of NaOH actually required:

Use the Henderson- hasselbalch formula to calculate the Ph of the buuffer

that is

Ph = Pka + log{[salt]/[acid]}

if you know the values of Ph , Pka of weak acid and no.of moles of acid then calculate no. of moles of salt

from the no.of moles of salt calculate no. of moles of base

once no.of moles of base has known you can able to calculate volume of the base by using

the formula V = no.of moles/molarity

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