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# C2H2O4 (is not the formula of carboxylic acid ?) what formula am I suppose to workout watch

1. Hi everyone,

I don't really know if I am doing this question right:

2.954g of a dicarboxylic acid Q was dissolved into 500cm3 of solution. A portion of 25.0cm3 of the solution was then taken and required 27.3cm3 of sodium hydroxide solution at 0.104moldm3. Determine the formula of the dicarboxylic acid Q.

I used this balanced equation: C2H2O4 + 2NaOH NaC2O4 + 2H3O

and calculated the Mr of C2H2O4 to be 104.043. Dividing this answer by the Mr(C2H2O4) gives me 1.156....
Now I am not sure if this is correct.

Could someone please verify that the balanced equation is correct and that the Mr I obtained is correct for this question.
Any help and pointer are appreciated

2. (Original post by Islamike)
Hi everyone,

I don't really know if I am doing this question right:

2.954g of a dicarboxylic acid Q was dissolved into 500cm3 of solution. A portion of 25.0cm3 of the solution was then taken and required 27.3cm3 of sodium hydroxide solution at 0.104moldm3. Determine the formula of the dicarboxylic acid Q.

I used this balanced equation: C2H2O4 + 2NaOH NaC2O4 + 2H3O

and calculated the Mr of C2H2O4 to be 104.043. Dividing this answer by the Mr(C2H2O4) gives me 1.156....
Now I am not sure if this is correct.

Could someone please verify that the balanced equation is correct and that the Mr I obtained is correct for this question.
Any help and pointer are appreciated

You should just use the formula H2X for the dicarboxylic acid.

Titration values give you moles of NaOH

You should use the 2:1 ratio of reaction to then determine moles of dicarboxylic acid (be careful with the dilutions here)

Then you divide the mass used of the carboxylic acid by the number of moles to get the Mr

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