Question

PAP 25.0 cm? of sulphuric acid neutralises 50.0 cm 0.1 mol dm sodium hydroxide solution. What is the molarity of the sulphuri

why is the ans A?

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Answer #1

Balanced chemical equation is:

2 NaOH + H2SO4 ---> Na2SO4 + 2 H2O

Here:

M(NaOH)=0.1 mol/dm^3

V(NaOH)=50.0 cm^3

V(H2SO4)=25.0 cm^3

According to balanced reaction:

1*number of mol of NaOH =2*number of mol of H2SO4

1*M(NaOH)*V(NaOH) =2*M(H2SO4)*V(H2SO4)

1*0.1*50.0 = 2*M(H2SO4)*25.0

M(H2SO4) = 0.10 mol/dm^3

Answer: A

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