Preparation of Nitrogen IV Oxide and Nitrous Acid Anhydride

Preparation of Nitrogen(IV) Oxide and Nitrous Acid Anhydride. 

Dry lead nitrate and quartz sand in a drying cabinet at 120 °C. Assemble an apparatus as shown in Fig. 86a. Put a mixture of 70 g of finely comminuted lead nitrate and 20 g of dry quartz sand into retort 1. Fill columns 2 and 3 with phosphorus anhydride applied onto glass wool. Place thoroughly dried receiver 4 into a beaker with dry ice . Heat the retort with a strong burner flame. Give attention to how the colour of the gas changes in liquefaction. 

Assemble an apparatus for preparing nitrogen(II) oxide (Fig. 865). Pour a concentrated solution of sulphuric acid into wash bottles 7, and fill columns 8 with phosphoric anhydride applied onto glass wool. Dissolve 15 g of potassium nitrite and 7.5 g of potassium iodide inj75 ml of water. Pour the solution into flask 6. Pour a 50% sulphuric acid solution into dropping funnel 5. 

After about 10 cm of solid nitrogen (IV) oxide gathers in receiver 

Carry out reactions characterizing the properties of nitrogen(III) oxide. 

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