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ana Chrome File Edit View History Bookmarks Window People Help b O (47% Tue Mar 24 5:26 PM a O National Collegiate Athletic Bb pt Problems spring x http x C Methoxide lon, CH30 Anex M C chemistry question l cheg x C chegg study l Guided solu x x C I rnij C https:// mycourses.purdue.edu /bbcswebdav/pid-4873955-odt content 1/courses/isscoursemerge wl 201520 mille201_1419103016745/Concept%2 E 4. Consider the following aqueous salt solutions, I. 0.10 M NaNO2 II. 0.10 M NaF III. 0.10 M HCOONa Which of these solutions would be expected to have the highest pH, and which solution would be expected to have the lowest pH? Explain your reasoning. CHNO2, Ka 7.1 x 10 4: HF, Ka 6.8 x 10 4, HCOOH, Ka 1.8 x 10 4) 31

Explanation / Answer

1) 0.1 M NaNO2 pH is lowest . it is because its Ka value higest then pKa value lowest .

       If its pKa less, pH is also less. it from the relation pH= 7 + 1/2*pKa + 1/2* logC

all are strong base weak acid type salts so the pH>7

2) 0.1M HCOONa has highest pH.

reason: its ka less and pKa more pH is also more from the relation above

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