Cengage Chaptor 14: EOC A 0.43 M solution of ammonia was titrated with hydrochlo

Question

Cengage Chaptor 14: EOC A 0.43 M solution of ammonia was titrated with hydrochloric acid to the cquivalence point, where the total volume was 1.50 times the original volumc. At what pH does thoc equivalence point occur? 1pt 1 pt 1 pt 1 pt 0 pt 1 pt Question 29 Question 30 K 1.8x10-5 Question 31 pH- Question 32 Question 33 Submit Answer Try Another Version 10 item attempts remaining Question 34 Question 36 Question 38 1 pt Question 37 1 pt Question 38 1 pt 1 pt 1pt 1 pt 1 pt 1 pt Question 39 Question 40 Question 41 Question 42 Question 43 Question 44 Progress 22/61 items Due Nov 1 at 11:55 PM Screenshat saved I he screenshot was added to your OneDrivc. OneDrive 3:20 PM 11/12017 Type here to search

Explanation / Answer

NH3 +HCl ----------> NH4+ + Cl-

at equivalence point all NH3 becomes NH4+

[NH4+] = (0.43 x 1 / 1.50) = 0.287 M

for NH4+

pOH = 1/2 [pKw + pKb + logC]

pKb = - log Kb = - log [1.8 x 10-5]

pKb = 4.74

pOH = 1/2 [14 + 4.74 + log 0.287]

pOH = 9.10

pH = 14 - 9.10

pH = 4.90

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