A sodium hydroxide sample is contaminated with sodium chloride. A 0.240 gram sample of this impure sample is dissolved in water and titrated with 21.50 mL of 0.130 M H2C2O4. Calculate the percent sadium hydroxide in the impure sample [(mass of NaOH in impure sample/mass of impure sample)*100%].

Question

A sodium hydroxide sample is contaminated with sodium chloride. A 0.240 gram sample of this impure sample is dissolved in water and titrated with 21.50 mL of 0.130 M H2C2O4. Calculate the percent sadium hydroxide in the impure sample [(mass of NaOH in impure sample/mass of impure sample)*100%].
Please help me

DrBob222 · Answer

2NaOH + H2C2O4 ==> Na2C2O4 + 2H2O

mols H2C2O4 = M x L = ?
Using the coefficients in the balanced equation, convert mols H2C2O4 to mols NaOH (that's mols NaOH = 2 x mols H2C2O4).
Then g NaOH = mols NaOH x molar mass NaOH.
Finally,
(g NaOH/mass sample)*100 = %NaOH