Hydrogen: reactions of elements

Reaction of hydrogen with air

Hydrogen is a colourless gas, H2, that is lighter than air. Mixtures of hydrogen gas and air do not react unless ignited with a flame or spark, in which case the result is a fire or explosion with a characteristic reddish flame whose only products are water, H2O.

2H2(g) + O2(g) → 2H2O(l)

Reaction of hydrogen with water

Hydrogen does not react with water. It does, however, dissolve to the extent of about 0.00160 g kg-1 at 20°C (297 K) and 1 atmosphere pressure.

Reaction of hydrogen with the halogens

Hydrogen gas, H2, reacts with fluorine, F2, in the dark to form hydrogen(I) fluoride.

H2(g) + F2(g) → 2HF(g)

Reaction of hydrogen with acids

Hydrogen does not react with dilute acids.

Reaction of hydrogen with bases

Hydrogen does not react with dilute bases.

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