question 2 Experiment 5: Prelab Worksheet (Hand in at the start of the experimen

Question

question 2

Experiment 5: Prelab Worksheet (Hand in at the start of the experiment) Name: Date: Section: Grade: Record all values with the correct number of significant figures and units Place all answers on the line next to the question Show calculations for any numerical answers See any 114 TA in the help office before your prelab is due if you have any questions Your answer must be completely correct to get any credit for the answer, no partial credit You make a solution of a weak acid with a pH of 3.75 and the pKa is 5.42 1. Is the solution acidic or basic? 2. Calculate the [H30] 3. Calculate the pOhH 4. Calculate the [OH] 5. Calculate the pKs 6. Calculate the Kb 93

Explanation / Answer

1. pH = -log[H+] = -log[H3O+]

2. pKa = -logKa

3. pH + pOH =14

4. pKa + pKb =14

5. [H+] = [H3O+] = (Ka x concentration)

6. [H+] = 10-pH

7. [H+][OH-] = 1.00 x 10-14

Answers are in BOLD

1. A pH of 3.75 represents an acidic solution according to sorensen

2. pH = 3.75 ==> [H+] = [H3O+] = 10-3.75 = 1.78 x 10-4 M

3. pOH = 14 - pH = 14 - 3.75 = 10.25

4. [OH-] = 1.00 x 10-14 / 1.78 x 10-4 = 5.62 x 10-11 M

5. pKb = 14 - pKa = 14 - 5.42 = 8.58

6. Kb = 10-pKb = 10-8.58 = 2.63 x 10-9

Hope i have given enough to you my friend!

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