chem lab

when an aqueous solution suspected of containing BA2+ or Pb2+ or both is mixed with sulfuric acid a precipitate forms. In another test, when the original solution is mixed with an aqueous solution of sodium sulfide no precipitate forms. What do these two tests indicate about the likely presence of Ba2+ and Pb2+ in the original solution? Explain your answer.

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  1. Pb is present. Ba is not present. Do you know why?
    Ba^+2 + SO4^= ==> BaSO4(s) white ppt.
    Pb^+2 + SO4^= ==> PbSO4(s) white ppt.

    Ba^+2 + S^= ==> BaS is soluble; therefore, no ppt.
    Pb^+2 + S^= ==> PbS(s) black ppt.

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