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Fundamentals Of Analytical Chemistry 9th Edition - Skoog Calculate the pH of the solution that results...

Fundamentals Of Analytical Chemistry 9th Edition - Skoog

Calculate the pH of the solution that results when 20.0mL of 0.200M formic acid, HCOOH is mixed with 25.0mL of 0.200M NaOH?

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Answer #1

To answer this question we have first to write the chemical reaction that happens (if any exist). In this case formic acid (wek acid) reacts with sodium hydroxide to form sodium formate and water according to:

HCOOH + NaOH HCOONa + H2O

After that we calculate the moles of each reactant:

Based on the stoechiometry of the reaction HCOOH is the limiting reagent and NaOH is in excess. HCOOH is completely converted to HCOONa and excessive amount of NaOH remains in the solution:

NaOH is a strong base which indicates that it is completely dissociated in water and its pH can be easily calculated based on the general formula for strong bases:

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