A supply of copper pipes is stored outdoors. Over the course of many years, the copper reacts with oxygen and turns green. What
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Answer : The pH at equivalence is, 9.08
Explanation : Given,
Concentration of = 0.1917 M
Volume of = 220.0 mL = 0.220 L (1 L = 1000 mL)
First we have to calculate the moles of
As we known that at equivalent point, the moles of and KOH are equal.
So, Moles of KOH = Moles of = 0.0422 mol
Now we have to calculate the volume of KOH.
Total volume of solution = 0.220 L + 0.00754 L = 0.22754 L
Now we have to calculate the concentration of KCN.
The balanced equilibrium reaction will be:
Moles of = 0.0422 mol
At equivalent point,
Given:
Now put all the given values in the above expression, we get:
Therefore, the pH at equivalence is, 9.08