posted by Cassie .
H2C2O4 * 2H2O (s) is a primary standard substance. 2.3688 grams of oxalic acid dihydrate were completely neutralized by 42.56 milliliters of NaOH solution. Calculate the molar concentration of the NaOH solution.
H2Ox + 2NaOH ==> 2H2O + Na2Ox
moles H2Ox = grams/molar mass
Convert moles H2Ox to moles NaOH using the coefficients in th balanced equation. That will give you moles NaOH = 2 x moles H2Ox.
Then M NaOH = moles NaOH/L NaOH.