Chem 2 16) A 30.0 mL solution of 0.6 MHzco, is titrated against different soluti

Question

Chem 2 16) A 30.0 mL solution of 0.6 MHzco, is titrated against different solutions of bases. Which base will require the minimum volume to completely neutralize al of the Hacos a. 0.1 M NaOH b. 0.2 M KOH c. 0.1 M Sr(OH)2 d. 0.2 M Ba(OH)2 e. 0.5 M NH3 Part B: 6 multiple choice questions. The correct answer is worth3points, and the appropriate work is worth an additional 3 points for a total of 6 points per question. The section is worth 36 points. a. 9.81 x 10 11 b. 6.25 x 1040 c. 2.24 x 10 10 d. 5.00 x 10 20 e. 1.70 x 10 10 Show Work: 18) A 100 mL sample of 0.350 M HI is titrated with 0.250 M Ba(oH)2. What volume of Ba(OH)2 is required to reach the equivalence point? a. 0.14 mL b. 0.07 mL c. 0.35 L d, 70 mL e. 140 mL Show Work:

Explanation / Answer

(d) 0.2 M of Ba(OH)2

as this will give maximum concentration of OH of 0.4 M

for others it will be

0.1 M NaOH 0.1

0.2 M KOH 0.2

0.1 M Sr(OH)2 0.2

0.5 M NH3 will be less as it is not a strong base

Fe(OH)3 <-----> Fe3+ + 3 OH-

x x 3 x

so Ksp = [Fe3+] [OH-]3 = 2.5 * 10-39

x (3x)3 = 2.5 * 10-39

x = 9.8 * 10-11   Answer

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