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6. (a) Construct a log Il-pH diagram to determine the pH of a solution containing 10-3 M Na2CO3 (PKAI = 6.37. KA2 = 10.33) an
7. Assume that a wastewater contains phenol (CH3OH) as a major constituent. Write the redox half reactions for the conversion
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Answer #1

Question 6.

Part (a).

The pH of 10-1 M acetic acid = 1/2 (pKa - Log[acetic acid]) = 1/2 (4.74 - Log10-1) = 2.87

Since 10-3 M basic salt (Na2CO3) is added, the pH will increase slightly.

Therefore, the pH of the resulting solution ~ 2.97

Part (b).

If 10-3 M NaOH is added to the solution in Part (a), the pH will further increase.

Therefore, the pH of the resulting solution ~ 3.07

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