Answered Essay: I used 4.5 mL of HCl acid to adjust the acetate buffer to pH of 4.76, how would i calculate the

I used 4.5 mL of HCl acid to adjust the acetate buffer to pH of 4.76, how would i calculate the mol of aicd or base needed to bring the pH to 4.76?

Here’s the question from the book.

In Part A, using the volume of acid or base needed to adjust the acetate buffer to pH 4.76 and knowledge of the concentration of acid/base, calculate the mol of acid or base needed to bring the pH to 4.76.

Experiment #2: pH Measurements and Buffers

Part A: Buffer Preparation

To make a 0.1 M sodium acetate solution at pH 4.8, start by measuring 80 ml of water with a graduated cylinder. Add the water to a 150 ml beaker. Weigh out 1.361 g of sodium acetate powder on the Ohaus balance, and add to the water. Use a stir bar to completely dissolve the solid. Pour the solution back into the 100 ml graduated cylinder and measure the volume after the sodium acetate was added to the water.

Pour back into the 150 ml beaker, maintain constant stirring with a magnetic stir bar.

Add acid or base as needed to adjust the pH to approximately 4.76 (values between 4.70 and 4.80 are fine). Note the molarity of your acid and base solutions that you use.

Pour solution into a 100 ml graduated cylinder, determine the final volume after adding the acid or base, and calculate the volume of acid/base added to achieve the desired pH.

Bring up to 100 ml final volume with water in a 100 ml graduated cylinder.

Check and record the final pH of your 100 ml of acetate buffer. This solution is needed for Part B; do not discard.

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