14a-salt-solubility - CHM151LL SOLUBILITY OF A SALT | 1...

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CHM151LL: SOLUBILITY OF A SALT | 1 Temperature Dependence of Salt Solubility OBJECTIVES: Become familiar with the effect of temperature on solubility Graph the relationship between solubility and temperature DISCUSSION: In this lab exercise, you will study the effect of changing temperature on the amount of solute (potassium nitrate) that will dissolve in a given amount of solvent (water). Water solubility is expressed as the mass of solute that dissolves in 100 g of water at a certain temperature. The 61 st edition of the CRC Handbook of Chemistry and Physics lists the cold-water solubility of ammonium iodate as 2.06 15 . That is, at 15 °C, 100 g of water will dissolve 2.06 g of NH 4 IO 3 at most. Any more NH 4 IO 3 added will drop to the bottom of the solution, still in solid form. In this lab, you will dissolve different quantities of potassium (KNO 3 ) in the same amount of water at a relatively high temperature. As each solution cools, you and a partner will monitor the temperature and observe the precise instant at which solid crystals begin to form. At this instant, the solution is saturated . That is, it contains the maximum amount of solute it can hold at that temperature. You will make a solubility curve –a graph of the solubility (in g KNO 3 per 100 g H
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14a-salt-solubility - CHM151LL SOLUBILITY OF A SALT | 1...

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