For #11 only need (g) & (h) Please help. CH182 TH2 Given: Nov 11, 2017 Due: Now

Question

For #11 only need (g) & (h)
Please help. CH182 TH2 Given: Nov 11, 2017 Due: Now 27, 2017 11. Analyze the following graphs for (12) answering the questions below: 12 10 pH 20 25 30 m L of base added a. Graph a g'weak acidl titrated with a strong baselacid 15 20 25 b. Graph 2 i e. Graph 3 is a d. What is the equivalence point for Graph l e. What is the volume of base to reach the equivalence point in Graph 12Sm, Graph f. What is the pH of the weak acid where pH pk.? g What is the volume of the base used for item f above? h. What is the K of the acid? acid titrated with a baselacid Graph 2 ES1PHunits 2 om ce point pH L Indicate the buffer region on the weak acid-strong base titration curve. ion in ve I

Explanation / Answer

Q11

g)

find volume used for f:

when pH = pKa, then

this is half equivalence point

Vequivalence --> 25 mL for graph 1, and graph 2 = 20 mL

half point --> 25/2 = 12.5 mL for graph 1; V = 20/2 = 10 mL for graph 2

h)

Ka for acid can be obtained in half points

pH = pKa is true at V = half point

pH marked at V = 12.5 mL --> 4.75 approx for graph 1

then

pKa = pH = 4.75

Ka = 10^-4.75 = 1.8*10^-5

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