Question

Potassium acid phthalate, KHC8H4O4, is a crystalline solid that is available in a state of high purity, making it an excellent choice as a standard acid. What is the concentration of a NaOH solution, if it takes 17.00 mL to neutralize a 0.0310 g sample of the acid? For the neutralization reaction, KHC8H4O4(aq) --> K+(aq) + H+(aq) + C8H4O42-(aq)

Answer 1

KHC8H4O4(aq) + NaOH(aq) ------------------> KNaC8H4O4(aq) + H2O

no of moles of KHC8H4O4   = W/G.M.Wt

                                             = 0.031/204.227   = 0.00015moles

1 moles of KHC8H4O4 react with 1 mole of NaOH

0.00015 moles of KHC8H4O4 react with 0.00015 moles of NaOH

molarity of NaOH   = no of moles/volume in L

                              = 0.00015/0.017   = 0.0088 M >>>>answer