tate the name of the catalyst used in the catalytic addition of steam to ethene.

The catalyst used in the catalytic addition of steam to ethene is typically phosphoric acid (H₃PO₄). This reaction is part of the process known as hydration of alkenes, where steam (water vapor) is reacted with ethene to produce ethanol. Phosphoric acid acts as a catalyst by speeding up the reaction without being consumed in the process.

In practice, this reaction occurs under high temperature and pressure conditions, allowing the gaseous reactants to convert into a liquid product (ethanol) efficiently. The role of phosphoric acid is crucial as it provides an acidic environment that facilitates the addition of water to the ethene molecule, aiding in the formation of the alcohol.