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Nascent Hydrogen. The hydrogen gas, which is just liberated as a result of a chemical is called nascent hydrogen or newly born hydrogen. It is obtained by passing dihydrogen gas at atmospheric pressure through an electric arc between two tungsten rods. The electric arc maintains a temperature around 4000 - 4500Â°C.
Obviously, sodium is an extremely reactive metal. When sodium comes into contact with water, it displaces hydrogen gas as follows: 2 Na(s) + 2H 2 O() 2 NaOH(aq) + H 2 (g). This is a dangerous reaction. If the sodium gets hot enough, the hydrogen jets can ignite and burn. That's what caused the sparks you saw. Burning hydrogen makes the temperature rise even faster.