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50cm3 of saturated solution of sodium trioxocarbomate(iv) at 25°C was diluted to 250cm3 of distilled...

50cm3 of saturated solution of sodium trioxocarbomate(iv) at 25°C was diluted to 250cm3 of distilled water. If 25cm3 of this solution were neutralized by 22.50cm3 of 0.25mol/dm3 hydrochloric acid. Calculate the concentration of Na2CO3 in mol/dm3 an in g/dm3.
Solubility of Na2CO3 at 25°C in mol/dm m3
Volume of CO2 that would be liberated at STP from 1dm3 of Na2CO3?

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