Question

Write a note on laboratory preparation of carbon monoxide from sulphuric acid and formic acid. ​

Answer 1

Due to the toxicity of carbon monoxide) work is done in well-ventilated hood. Flask with concentrated sulfuric acid with the stopper inserted for the gas outlet and a dropping funnel for the formic acid. Flask with acid is heated to about 100° C and 98% formic acid is added. Carbon monoxide release rate is adjusted by formic acid addition rate. The reaction slows down when sulfuric acid becomes diluted. Then the flask is gently heated. Carbon monoxide is purified (to remove carbon dioxide) and dried by passing through solid potassium hydroxide and calcium chloride. Carbon monoxide is a colorless, toxic gas with the boiling point – 190 °C, and melting point of -207 °C. Slightly soluble in water.