Explanation Given: Concentration of the polyprotic acid. 0.35 M H 3 PO 4 . 0.35 M H 2 C 2 O 4 Calculation: a) To determine the [ H 3 O + ] we need to consider the first dissociation constant. Second and third dissociation constant can be ignored as those are very small as compared to the first dissociation constant. First dissociation constant=7.1*10 −3 0.35 M H 3 PO 4 will produce 0.35 M [ H + ] and 0.35 [ H 2 PO − 4 ] Let’s consider [ H + ]=x then [ H 2 PO − 4 ] will be also x Now K a = [ H + ] [ H 2 PO − 4 ]/[ H 3 PO 4 ] or 7.1*10 −3 = x * x /(0.35-x) x 2 =7.1 * 0.35 * 10 −3 -7.1 * 10 −3 x or , x 2 -7.1 * 0.35 * 10 −3 -7.1 * 10 −3 x =0 o r , x = { − 7.1 * 10 − 3 ± [ ( 7.1 * 10 − 3 ) 2 − 4 * 1 * − 7.1 * 10 − 3 * 0.35 ] } / 2 o r , x = { − 7.1 * 10 − 3 ± [ ( 7.1 * 10 − 3 ) 2 + 4 * 1 * 7.1 * 10 − 3 * 0.35 ] } / 2 o r , x = { − 7.1 * 10 − 3 ± [ 5.041 * 10 − 5 + 9.94 * 10 − 3 ] } 2 o r , x = { − 7.1 * 10 − 3 + 9.9904 * 10 − 3 } / 2 o r , x = { ( 9.9904 − 7...

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Author: Tro

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Chapter 17, Problem 115E

Interpretation Introduction

To determine:

a)

[H₃O⁺] and P^H of 0.35 M H₃PO₄

b)

[H₃O⁺] and P^H of 0.35 M H₂C₂O₄

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Chapter 17, Problem 114E

Chapter 17, Problem 116E

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Chapter 17 Solutions

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a) [ H 3 O + ] and P H of 0.35 M H 3 PO 4 b) [ H 3 O + ] and P H of 0.35 M H 2 C 2 O 4

Solution Summary: The author explains that to determine the [ H 3 O + ] and P H of 0.35 M H 2 C 2 O 4 we need to consider the first dissociation constant.

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To determine:

a)

[H₃O⁺] and P^H of 0.35 M H₃PO₄

b)

[H₃O⁺] and P^H of 0.35 M H₂C₂O₄

Want to see the full answer?

Chapter 17 Solutions

a) [ H 3 O + ] and P H of 0.35 M H 3 PO 4 b) [ H 3 O + ] and P H of 0.35 M H 2 C 2 O 4

Solution Summary: The author explains that to determine the [ H 3 O + ] and P H of 0.35 M H 2 C 2 O 4 we need to consider the first dissociation constant.

Concept explainers

Videos

To determine: a) [H3O+] and PH of 0.35 M H3PO4 b) [H3O+] and PH of 0.35 M H2C2O4

Want to see the full answer?

Chapter 17 Solutions

To determine:

a)

[H₃O⁺] and P^H of 0.35 M H₃PO₄

b)

[H₃O⁺] and P^H of 0.35 M H₂C₂O₄