chemistry a level AQA titration question help

2.5g of a sample of ethanediol can acid, H2C2O4.nH2O, was dissolved in water and the solution made up to 250cm3. This solution was placed in a burette and 15.8cm3 were required to neutralise 25cm3 of 0.1mol dm-3 NaOH. Given that ethanediol acid reacts with NaOH in a 1:2 ratio, calculate the value of n.

i've gotten up to getting 126.4 as the Mr. I can't find a value for n.

i think you made a spelling error on the first line can u just clarify this for me what the questions asking

i haven't D: i just copied and pasted the question :c

is the answer 2.?

i got 5, but i can't find the mark scheme. idk, is it 2??????????

i did 126.4- mr of the molecule
then dvide by mr of water

oh, i just did 126.4- mr of molecule (which is 90) then i just did trial and error of 90 + (18 x n) until i got 5 as the correct number which made 126.4

no thats wrong you do 126.4-90 then divide this answer by 18

why do u divide it by the mr of water?

because you want to see how many water molecules are in the remaining mr (36.4)