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Hydroxide and bicarbonate cannot coexist in water because they

  • A.are both removed by boiling
  • B.precipitate one another as insoluble solids
  • C.react to form carbonate
  • D.have the same effect on the indicator

Answer: C

The hydroxide takes a proton from the bicarbonate to give carbonate and water, so the two are consumed the moment they meet and an analysis reporting both is in error. Hydroxide with carbonate, or carbonate with bicarbonate, are both possible.

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