The values you calculate for this Prelab Exercise are required for your experime
ID: 495033 • Letter: T
Question
The values you calculate for this Prelab Exercise are required for your experiment. Determine the [H_3 O^+] of the eight buffer solution made by mixing 1.10 M acetic acid and 0.900 M sodium acetate solution according to the following volumes. The pK_4, for acetic acid, CH_3 COOH (HAc), is 4.745. Show a detailed calculation for one of the solution. Determine the following, showing your work: The [H_3 O^+], in M, of 10.00 mL of 0.100 M NaOH after adding 10.00 mL of indicator solution. The [H_3 O^+], in M, of 10.00 mL of 0.100 M HCl after adding 10.00mL of the indicator solution.Explanation / Answer
For the buffer
HA +H2O ----------------> H3O+ + A-
[acid] [conjugate base] due to common ion effect
Thus Ka = [H3O+] [conjugate base] /[acid]
or [H3O+] = Ka [acid]/[conjugate base]
pKa of acetic acid = 4.75 and thus Ka = 1.8x 10-5
Thus
Q1)
S. No. [acid] mmol conjugate base]mmol [H3O+] 1 8x1 2x0.9 1.8x10-5 2 7x1 3x0.9 4.67x10-5 3. 6x1 4x0.9 3.0x10-5 4. 5x1 5x0.9 2.0x10-5 5. 4x1 6x0.9 1.33x10-5 6. 3x1 7x0.9 0.857x10-5 7. 2x1 8x0.9 0.5x10-5 8 1x1 9x0.9 0.22x10-5
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