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For which of the following are we permitted to make the assumption that the equilibrium concentration...

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Question

Chemistry

For which of the following are we permitted to make theassumption that the equilibrium concentration of the acid or baseis the same as the initial concentration when  wecalculate the pH of the solution specified?

(a)

0.020

M

HC

2

H

3

O

2

(c)

0.002

M

N

2

H

4

(b)

0.10

M

CH

3

NH

2

(d)

0.050

M

HCHO

Answer & Explanation Solved by verified expert
3.8 Ratings (340 Votes)
To do this you need to know the Ka or Kb values of each of this species If the value of Ka is lower than 1x103 order then you can assume that the concentration in equilibrium is the same as the innitial basically because the Ka or Kb    See Answer
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