Question & Answer: 125 mL of HCl was found. Without knowing the concentration you add 0.1 M NaOH until the…..

125 mL of HCl was found. Without knowing the concentration you add 0.1 M NaOH until the equivalence point was reached. In total you added 225 mL of NaOH. What is the pH at equivalence point and what is the concentration of HCl?

Expert Answer

Answer

moles of NaOH added= molarity* Volume in Liter=0.1*225/1000= 0.0225

The reaction betwen HCl and NaOH is HCl+ NaOH—->NaCl + H2O

1 mole of HCl requires 1 mole of NaOH

moles of HCl at equivalence point= 0.0225

Volume of HCl used= 125ml= 125/1000L=0.125L

Concentration of HCl =0.0225/0.125 =0.18M

since both HCl and NaOH are strong acid and bases, at equivalence point pH=7.

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