7:15 PM Sun Apr 19 75% Chemistry Structure and Properties - Tro, 2nd Edition PDF a. CIO4 0r CIO2 b. Cl or H,O c. CN¯ or ClO Polyprotic Acids 113. Write chemical equations and corresponding equilibrium expressions for each of the three ionization steps of phosphoric acid. 114. Write chemical equations and corresponding equilibrium expressions for each of the two ionization steps of carbonic acid. 115. Calculate the [H3O*] and pH of each polyprotic acid solution. а. О.350 М НЗРО4 b. 0.350 M H,C2O4 116. Calculate the [H3O*] and pH of each polyprotic acid solution. а. О.125 М Н,СОЗ b. 0.125 M H3C6H;O7 117. Calculate the concentration of each species in a 0.500 M solution of H2SO3. 118. Calculate the concentration of each species in a 0.155 M solution of H,COз- 768 119. Calculate the [H3O*] and pH of each H2SO4 solution. At approxi- mately what concentration does the x is small approximation break down? a. 0.50 M b. 0.10 M c. 0.050 M 120. Consider a 0.10 M solution of a weak polyprotic acid (H,A) with the possible values of Ka and Ka, given here. a. Ka аз = 1.0 X 10¯*; K, 5.0 X 10-5 j b. Ka 1.0 X 10*; Ka. = 1.0 X 10-5 c. K. 1.0 X 104; K, аз 1.0 X 10-6

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I'm not sure how to solve 115. I saw one solution that used the ka to solve it, but I don't understand how to find the ka to use or where they were able to get the ka from with the given information in the problem. So if you could please make this clear in the answer. Thank you for your help.

7:15 PM Sun Apr 19
75%
Chemistry Structure and Properties - Tro, 2nd Edition PDF
a. CIO4 0r CIO2
b. Cl or H,O
c. CN¯ or ClO
Polyprotic Acids
113. Write chemical equations and corresponding equilibrium
expressions for each of the three ionization steps of phosphoric
acid.
114. Write chemical equations and corresponding equilibrium
expressions for each of the two ionization steps of carbonic acid.
115. Calculate the [H3O*] and pH of each polyprotic acid solution.
а. О.350 М НЗРО4
b. 0.350 M H,C2O4
116. Calculate the [H3O*] and pH of each polyprotic acid solution.
а. О.125 М Н,СОЗ
b. 0.125 M H3C6H;O7
117. Calculate the concentration of each species in a 0.500 M solution
of H2SO3.
118. Calculate the concentration of each species in a 0.155 M solution
of H,COз-
768
119. Calculate the [H3O*] and pH of each H2SO4 solution. At approxi-
mately what concentration does the x is small approximation
break down?
a. 0.50 M
b. 0.10 M
c. 0.050 M
120. Consider a 0.10 M solution of a weak polyprotic acid (H,A) with
the possible values of Ka and Ka, given here.
a. Ka
аз
= 1.0 X 10¯*; K,
5.0 X 10-5
j
b. Ka
1.0 X 10*; Ka.
= 1.0 X 10-5
c. K.
1.0 X 104; K,
аз
1.0 X 10-6
Transcribed Image Text:7:15 PM Sun Apr 19 75% Chemistry Structure and Properties - Tro, 2nd Edition PDF a. CIO4 0r CIO2 b. Cl or H,O c. CN¯ or ClO Polyprotic Acids 113. Write chemical equations and corresponding equilibrium expressions for each of the three ionization steps of phosphoric acid. 114. Write chemical equations and corresponding equilibrium expressions for each of the two ionization steps of carbonic acid. 115. Calculate the [H3O*] and pH of each polyprotic acid solution. а. О.350 М НЗРО4 b. 0.350 M H,C2O4 116. Calculate the [H3O*] and pH of each polyprotic acid solution. а. О.125 М Н,СОЗ b. 0.125 M H3C6H;O7 117. Calculate the concentration of each species in a 0.500 M solution of H2SO3. 118. Calculate the concentration of each species in a 0.155 M solution of H,COз- 768 119. Calculate the [H3O*] and pH of each H2SO4 solution. At approxi- mately what concentration does the x is small approximation break down? a. 0.50 M b. 0.10 M c. 0.050 M 120. Consider a 0.10 M solution of a weak polyprotic acid (H,A) with the possible values of Ka and Ka, given here. a. Ka аз = 1.0 X 10¯*; K, 5.0 X 10-5 j b. Ka 1.0 X 10*; Ka. = 1.0 X 10-5 c. K. 1.0 X 104; K, аз 1.0 X 10-6
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