Concept explainers
Calculate the pH of a 0.91 M C2H5NH3I solution. (Kb for C2H5NH2 = 5.6 × 10−4.)
Interpretation:
The pH of a
Concept Information:
Acid ionization constant
The equilibrium expression for the reaction
Where
Base ionization constant
The equilibrium expression for the ionization of weak base
Where
Relationship between
Where,
Relationship between pH and pOH:
For calculation of pH, the following formula is used,
For calculation of pOH, the following formula is used,
From definition of pH and pOH, we get at room temperature,
To Calculate: The pH of a
Answer to Problem 16.97QP
Answer
The pH of a
Explanation of Solution
Record the given datas
The concentration of
The
The concentration of
Construct equilibrium table
The
In order to determine the pH, we must first determine the concentration of hydronium ion produced by the hydrolysis.
Express the equilibrium concentration of all species in terms of initial concentrations and a single unknown x
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Initial
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0.91
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Change
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Equilibrium
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Calculation
Calculate
The above equation can be rewritten as,
Solve for
Write the ionization constant expression in terms of the equilibrium concentrations. Knowing the value of the equilibrium constant
Therefore, the pH of the given solution is 5.39
The pH of a
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Chapter 16 Solutions
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