Substances which, in Contact with Water, Emit Flammable Gases

Substances which in contact with water emit flammable gases Water-reactive liquid, n.o.s., 4.3, 6.1, 8 Water-reactive solid, n.o.s., 4.1,4.2,4.3, 5.1, 6.1, 8 

Water (7732-18-5) is a simple molecule of two hydrogens attached to an oxygen atom, H-O-H. However, the few types of reaction it undergoes are universally fundamental to all forms of life. 

Certain compounds contain crystalline water as part of their structure and form hydrates. This water can be driven off by heating. One of the hydrates of sodium sulphate (Na2S04), for example, is its decahydrate, Na2S04 lOHOH. 

In hydrolysis, the H-OH bond in the water molecule splits and the reactions take place in the presence of the H and OH ions. For example, calcium carbide in water reacts to produce acetylene and calcium hydroxide in solution  

The excess of OH ions makes the solution alkaline. Or, in the case of many metals (M), hydrogen gas is given off leaving a hydroxide solution  

W Substances which, in contact with water, emit flammable gases, without subsidiary risk, and articles containing such substances  

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Substances which in contact with water emit flammable gases, liquid, corrosive, n.o.s. 3129... 

Substance which, in contact with water, emits flammable gases means a solid or liquid substance or mixture which, by interaction with water, is liable to become spontaneously flammable or to give off flammable gases in dangerous quantities ... 

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