SOLUTION AND ITS EFFECTS 159 



lighters, cigar lighters, and the burning points of pyrographic 

 instruments receive their heat from thus combining hydro- 

 gen, or compounds of hydrogen, by platinum, with oxygen. 



A solid is said to be insoluble when less than one part is 

 dissolved in 1000 parts of the solvent, while it is called soluble 

 if one part can be dissolved in 100 parts of the solvent. As a 

 rule, solids are more soluble in hot than in cold liquids. The 

 solution of solids usually lowers the temperature of the solvent. 

 References : 



1. 1501 : 22. Water and Solution. 



2. 1703 : 58-63. Solution and its Effects. 



3. 1803 : 121-124. Solution and Crystallization. 

 a. 1607 : 38-39. Solution of Solids. 



6. 1611 : 55-59. Plant Food in Soil Water. 



c. 1701:94-99. Solution. 



d. 1704:30-31. Solution. 



e. 1706:41-48. Solution. 



/. 1707 : 70-72. Water as a Solvent. 



g. 1709 : 40-45. Water and Solution. 



h. 1711 : 12-20. Solution. 



i. 1805:117. Solution. 



j. 1807 : 191. Heat of Solution Freezing Mixtures. 



k. 1808 : 29. Solutions. 



Experiment 59. Solution and its Effects. 

 Apparatus : Ring stand, asbestos mat, -burner, thermom- 

 eter, beaker, 100 c.c., platinum wire No. 30, 5" long, forceps. 

 Materials: Common salt, ammonium nitrate, ice. 



a. Warm some water in the beaker. Note the bubbles of 

 air which come out of the solution. 



b. Boil the water, and obtain its temperature. While still 

 heating add a little salt, and note the change of temperature. 

 Continue to add salt until the maximum temperature is 

 reached. How much is it ? 



