The Solubility Of Potassium Nitrate Lab Report.

711 words - 3 pages

The Solubility of Potassium NitrateAim:The aim of this experiment is to find out by how much the solubility of potassium nitrate into distilled water increases when the solution is heated, and if yes, by how much.Hypothesis:According to data on the internet, 3.75 × 10­¹ moles of potassium nitrate dissolve in 100g of water. I believe this information may be correct. I also believe that as the solute is absorbing outside heat, the energy is increased causing it to dissolve both faster, with more potassium nitrate.Apparatus:Bunsen burner25g Potassium nitrateDistilled waterBoiling tubeClampThermometerMethod:1) Weigh out 25g Potassium Nitrate into a boiling tube.2) Add 10ml water3) Heat solution over bunsen until potassium nitrate dissolves, moving the tube in and out of the flame so it doesn't boil over.4) Allow to cool and record temperature at which crystals appear5) Add 5ml of water and repeat steps 3) and 4)6) Repeat step 5) until you have 30ml of water in the boiling tube7) Transform data so it is expressed as a mass of potassium nitrate per 100g of water.8) GraphResults:Water (ml)Temp at which crystals appear ( C)Potassium Nitrate (g) per 100g of water101012501599166.620971252595100309383.3Mass of potassium nitrate dissolved at 40 : 64gMass of potassium nitrate dissolved at 80 : 169gMass obtained as crystals when solution cooled from 80 to 25 : 134g or 79.3%Two graphs: one from the internet, one made according to our results.Conclusion:From the results we can see that the solubility of potassium nitrate is increased as the temperature is increased. The relationship is nonlinear, which means it doesn't form a straight line when plotted on a graph. Now, there are three main factors, which affect solubility (besides pressure).Temperature will affect solubility. If the solution process absorbs energy then the solubility will be increased as the temperature is increased. If the solution process releases energy then the solubility will decreased with increasing temperature.Molecular size will affect the solubility. The larger the molecule or the higher its molecular weight the less soluble the substance will be. Larger molecules are more difficult to surround with solvent...

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