2. The confirmatory reactions that identity nitrate and nitrite both produce bro

Question

2. The confirmatory reactions that identity nitrate and nitrite both produce brown NO2 gas. What criterion will you use to determine which anion produced the gas? 3. The confirmation reaction for the halides invokes the addition of chlorine water. Describe how you will know which. if any, of the anions is present 4 A student added calcium ion. Ca: to an aqueous solution and observed formation of a precipitate. Addition of HNO3 had no effect on the precipitate. What anion was present in the original solution? Explain your answer.

Explanation / Answer

2.nitrate forms a brown ring that disappear with slight shaking. nitrite-forms a deep brown solution

3.Acidify a portion (1 mL) of the 'fusion' filtrate with 2N nitric acid, and if nitrogen and/or sulphur are present, boil for 1 - 2 minutes.* Cool and add aqueous silver nitrate (1 mL), compare with a blank. Formation of a heavy, white or yellow precipitate of silver halide indicates halogen. If a positive result is obtained: acidify the remaining portion of the 'fusion' filtrate with dilute sulphuric acid, boil and cool. Add carbon tetrachloride (1 mL) and a few drops of freshly prepared chlorine water. Shake the mixture.

(a) If the carbon tetrachloride layer remains colourless - indicates chlorine.

(b) If the carbon tetrachloride layer is brown - indicates bromine.

(c) If the carbon tetrachloride layer is violet - indicates iodine.

3.sulphate anion.

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