Field, laboratory, and library manual in physical geography . Fig. 25. Contour Map of the Dead Sea,Palestine, Western Asia EXERCISE LIISOLIDS IX SOLUTION Fill a small beaker half full of water. Add a very littlepowdered alum and stir the mixture. Can you see the alum ?What has become of it? It is said to be in solution; water iscalled a *lvent and alum is said to be soluble. Add powdered 136 PHYSICAL GEOGRAPHY MANUAL. alum slowly, stirring all the time. Continue this until the alumno longer dissolves, but settles to the bottom of the solution is now said to be saturated. Define satu
Field, laboratory, and library manual in physical geography . Fig. 25. Contour Map of the Dead Sea,Palestine, Western Asia EXERCISE LIISOLIDS IX SOLUTION Fill a small beaker half full of water. Add a very littlepowdered alum and stir the mixture. Can you see the alum ?What has become of it? It is said to be in solution; water iscalled a *lvent and alum is said to be soluble. Add powdered 136 PHYSICAL GEOGRAPHY MANUAL. alum slowly, stirring all the time. Continue this until the alumno longer dissolves, but settles to the bottom of the solution is now said to be saturated. Define saturated solu-tion. Your beaker now contains a saturated solution, with alittle of the undissolved solid as a sediment in the bottom. Putthis over the flame of the Bunsen burner and heat it until itboils. What becomes of the sediment?Is cold or hot water capable of holdinga larger amount of alum in solution?Make a very strong solution of alum inwater and pour it into a beaker with theend of a string hanging down into it, asshown in Fig. 26. Let the beaker standfor a day or two until part of the solutionevaporates. Remove the string from thesolution. Describe what you see. Whateffect have cooling and evaporation upona saturated solution? How could youseparate a solid in solution from itssolvent ?Arrange a piece of apparatus as shown in Fig. 27. Partlyfill the bottle with a saturated solution of photographers hypo(
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