The soluble sulfate is precipitated by BaCl2, barium sulphate is formed:
"SO_4^{2-} + Ba^{2+}\\rightarrow BaSO_4\\downarrow" .
The number of the moles of the precipitate barium sulphate is equal to the number of the moles of soluble sulphate:
"n(\\text{SO}_4^{2-})=n(\\text{BaSO}_4^{2-})" .
The mass of the barium sulphate is:
"m(\\text{BaSO}_4) = m(\\text{crucible with BaSO}_4) - m(\\text{crucible})"
"m(\\text{BaSO}_4) =30.3375 - 29.9442 = 0.3933" g.
Answer: the mass (g) of BaSO4 from the experiment is 0.3933 g
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