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The reaction of the weak acid HCN with the strong base KOH is: HCN(aq) + KOH(aq) âŸ¶ H2O(l) + KCN(aq) To compute the pH of the resulting solution if 51 mL of 0.85 M HCN is mixed with 27 mL of 0.36 M KOH, we need to start with the stoichiometry. Let us do just the stoichiometry in steps. How many moles of acid? Number of moles: How many moles of base? Number of moles: What is the limiting reactant? Limiting reactant: How many moles of the excess reactant after reaction? Number of moles: What is the concentration of the excess reactant after reaction? Concentration: What is the concentration of the pH active product after reaction?

          The reaction of the weak acid HCN with the strong base KOH is:
HCN(aq) + KOH(aq) âŸ¶ H2O(l) + KCN(aq)

To compute the pH of the resulting solution if 51 mL of 0.85 M HCN is mixed with 27 mL of 0.36 M KOH, we need to start with the stoichiometry. Let us do just the stoichiometry in steps.

How many moles of acid? Number of moles:
How many moles of base? Number of moles:
What is the limiting reactant? Limiting reactant:
How many moles of the excess reactant after reaction? Number of moles:
What is the concentration of the excess reactant after reaction? Concentration:
What is the concentration of the pH active product after reaction?

Added by Greg M.

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