Cheryl’s precipitate

Albert and Bernard just became friends with Cheryl, and they now know when her birthday is! They see that she is holding a test tube containing a solution and a precipitate, which she tells them that she has produced by mixing two 0.02 M aqueous solutions. They want to know what precipitate she has produced. Cheryl gives them a list of possible cations and anions present in the original solutions: Na+, Ag+, Ba2+, Mg2+, OH, CO32–, Cl, SO42–. She tells Albert the identity of the anion present in the precipitate and Bernard the identity of the cation present in the precipitate.

Albert: I don’t know what the precipitate is.

Bernard: I didn’t, but now that you’ve said that, I do.

Albert: Then so do I.

What is the precipitate?


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