anactualmess
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A student added 627 mg of hydrated sodium carbonate (Na2CO3.xH2O) to 200 cm3of 0.250 mol dm–3 hydrochloric acid in a beaker and stirred the mixture. After the reaction was complete, the resulting solution was transferred to a volumetric flask, made up to 250 cm3 with deionised water and mixed thoroughly.Several 25.0cm3 portions of the resulting solution were titrated with 0.150 mol dm–3 aqueoussodium hydroxide. The mean titre was 26.60 cm3 of aqueoussodium hydroxide.Calculate the value of x in Na2CO3.xH2O Show your working.Give your answer as an integer.[7 marks]

I have worked out the moles for HCl (0.05) and for NaOH (3.99x10^-2)

What do I do now lol
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BobbJo
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(Original post by anactualmess)
A student added 627 mg of hydrated sodium carbonate (Na2CO3.xH2O) to 200 cm3of 0.250 mol dm–3 hydrochloric acid in a beaker and stirred the mixture. After the reaction was complete, the resulting solution was transferred to a volumetric flask, made up to 250 cm3 with deionised water and mixed thoroughly.Several 25.0cm3 portions of the resulting solution were titrated with 0.150 mol dm–3 aqueoussodium hydroxide. The mean titre was 26.60 cm3 of aqueoussodium hydroxide.Calculate the value of x in Na2CO3.xH2O Show your working.Give your answer as an integer.[7 marks]

I have worked out the moles for HCl (0.05) and for NaOH (3.99x10^-2)

What do I do now lol
You have found the number of moles of HCl that would react with NaOH in 250cm3.
Find the number of moles of HCl that reacted with hydrated sodium carbonate in 250cm3
Find the number of moles of hydrated sodium carbonate in 250cm3
This contains 627 mg
So find the molar mass of hydrated sodium carbonate
Find the value of x to the nearest integer (1)
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