test for anions

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5 Terms

1
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describe the test and observations for Carbonate Ion, CO32

  • Add dilute HCL. Bubble the gas given off into limewater.

  • Effervescence is observed. Colorless, odorless gas evolved forms a white ppt when bubbled into limewater. 

    CO2 gas is evolved.

2
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describe the test and observations for Sulfate Ion, SO42-

  • Add dilute HNO3, then add barium nitrate solution.

  • White ppt is formed.

3
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describe the test and observations for Chloride Ion, Cl-

  • Add dilute HNO3, then add silver nitrate solution.

  • White ppt is formed.

4
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describe the test and observations for Iodide Ion, I-

  • Add dilute HNO3, then add silver nitrate solution.

  • Yellow ppt is formed.

5
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describe the test and observations for Nitrate Ion, NO3-

  • Add NaOH solution, then add a piece of aluminum foil. Warm the mixture. Test gas given off with a piece of moist red litmus paper.

  • Effervescence is observed. Colorless and pungent gas evolved which turns moist red litmus paper blue. Ammonia gas, NH3 is evolved.