PLEASE DO YOUR BEST TO ALL WORK COMPLETELY AND METHODICALLY THANK YOU Consider t

Question

PLEASE DO YOUR BEST TO ALL WORK COMPLETELY AND METHODICALLY THANK YOU

Consider the titration of a weak acid with a strong base. Determine the pH at the equivalence point when 10.0 mL of 1.55 M HC2H3O2 is titrated with 1.25 M NaOH. Ka(HC2H3O2) = 1.8 x 10-5 Kw(H2O) = 1.0 x 10-14

You need the volume of NaOH required to reach the equivalence point.

The volume of NaOH is _______ mL. Notice the molarities of the acid and base are NOT the same but that they react 1 mole base for each mole of acid.

AGAIN THANK YOU. AND PLEASE KEEP IN MIND THE WORK IS THE MOST IMPORTANT PART SO JUST TO MAKE SURE YOU ARE PROVIDING THE RIGHT WORK THE ANSWER IS pH= 9.29

Explanation / Answer

Number of moles of Acid = 10*1.55 = 15.5 mmol
at equivalence point number of moles of acid = number of moles of base
Number of moles of NaOH = 15.5 mmol
volume of NaOH = 15.5/1.25 = 12.4 mL
At equivalence point salt is formed so
pH = 7 + 1/2(pKa + logC)
pH = 7 + 1/2(4.75 + log(12.4*1.275/(12.4+10))
pH = 9.2993

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