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21.5g of hydrated sodium carbonate of formula Na2CO3.xH2O were dissolved in water and made up to precisley 100cm3. 10cm3 of this solution were pipettee into a conical flask and titrates with 0.78 mol l^-1 hydrochloric acid (HCl); 7.1cm3 were requires. Calculate the value of x in the formula.
Na2CI3.xH2O + 2HCl -----> 2NaCl + CO2 + (x+1)H2O