Balanced chemical equation is:
NaOH + HnA ---> NaHn-1A + H2O
Here:
M(NaOH)=0.1038 M
V(NaOH)=22.86 mL
V(HnA)=52.0 mL
According to balanced reaction:
1*number of mol of NaOH =1*number of mol of HnA
1*M(NaOH)*V(NaOH) =1*M(HnA)*V(HnA)
1*0.1038*22.86 = 1*M(HnA)*52.0
M(HnA) = 0.04563 M
Answer: 0.04563 M
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