256 



Domestic Science 



with a small roll of platinum foil fused into the end 

 of the tube to form the jet. 



EXPERIMENT 114. Place a 

 piece of charcoal, about the size 

 of a hazel-nut, in a deflagrating 

 spoon, and lower the spoon into 

 another jar of oxygen, after 

 igniting one corner of the 

 charcoal in the Bunsen flame. 

 When all burning has ceased, 

 remove the spoon, quickly pour 

 in some water, and at once cover 

 the mouth of the jar with a glass 

 plate. Shake the jar and its 

 contents well. Into the liquid 

 thus obtained drop a little 



litmus solution. The bluish solution will become of a 

 dull purplish -red colour. 



By burning a second piece of charcoal in a fourth 

 jar, it may be shown, by inserting a lighted taper and 

 by shaking up a little lime-water in the jar, that the gas 

 left in the jar, after the combustion has taken place, is 

 carbon dioxide. 



Carbon + oxygen = carbon dioxide. 



EXPERIMENT 115. Burn a small piece of brimstone 

 or sulphur in similar fashion in a fifth jar. Observe 

 the production of white fumes, evidence that a certain 

 amount of a substance called sulphur trioxide has been 

 formed during the burning. The main product of 

 the action, however, is a colourless gas, sulphur 

 dioxide, and the presence of this may be detected 

 by cautiously smelling the contents of the jar after 

 combustion has ceased. Shake up with water and 



