A weighed portion of a mixture of sodium salts – carbonate, nitrate, sulfate, chloride and orthophosphate

| December 21, 2020 | education

A weighed portion of a mixture of sodium salts – carbonate, nitrate, sulfate, chloride and orthophosphate – weighing 8.09 g was dissolved in distilled water. A solution of barium nitrate was added to the resulting solution, resulting in a precipitate weighing 13.625 g. The precipitate was filtered off and treated with an excess of nitric acid solution, while gas was released in a volume of 0.366 L (n.a.) and the weight of the precipitate was 4.66 g. A raisin of lapis solution was added to the filter; the mass of the precipitated sediment is 2.87 g. Calculate the masses of substances in the original mixture.

write the reaction equation
BaCO3 + 2HNO3 = Ba (NO3) 2 + H2O + CO2
find out how many moles CO2 was released = 0.336 / 22.4 = 0.015 mol.
CO2 came from sodium carbonate so it was also 0.015 mol.
The undissolved residue is barium sulfate and phosphate.



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