Two students tested a green compound X.The students added water to compound X. Compound X did not dissolve. The students then added a solution of ethanoic acid to compound X. A gas was produced which turned limewater milky. Student A concluded that compound X was sodium carbonate. Student B concluded that compound X was copper chloride. Which student, if any, was correct? Explain your reasoning – 6133

One thought on “Two students tested a green compound X.The students added water to compound X. Compound X did not dissolve. The students then added a solution of ethanoic acid to compound X. A gas was produced which turned limewater milky. Student A concluded that compound X was sodium carbonate. Student B concluded that compound X was copper chloride. Which student, if any, was correct? Explain your reasoning – 6133”

1. Student A was incorrect
   Because sodium compounds are usually white, not green,
   or because sodium carbonate is soluble,
   so it can’t contain sodium ions.

   Student B was also incorrect
   Because when you add acid to a carbonate, it gives off carbon dioxide,
   so it must contain carbonate ions, not chloride ions.

   Reply