Question: please do it urgent needed Question 11. An unknown diprotic acid, H2X, reacts with sodium hydroxide as shown in the equation: H2X + 2NaOH NazX

please do it urgent needed Question 11. An unknown diprotic acid, H2X, please do it urgent needed

Question 11. An unknown diprotic acid, H2X, reacts with sodium hydroxide as shown in the equation: H2X + 2NaOH NazX +2H2O 1.31 g of the acid was dissolved in deionised water and made up to 250 cm solution in a volumetric flask. 25.0 cm3 samples of this solution was titrated against 0.104 mol dm sodium hydroxide solution, requiring a mean volume of 21.45 cm for neutralisation. a) i. The mean volume of sodium hydroxide was calculated from [1] concordant titres. What is meant by concordart titres? ii. Calculate the moles of sodium hydroxide. [1] iii. Calculate the moles of the unknown acid in 25cm?. [2] iv. Calculate the moles of the unknown acid in 250cm. [1] v. Calculate the relative formula mass, Mr, of the unknown acid. [1]

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