Find the solubility of potassium nitrate in water at different temperatures and to estimate the solubility of potassium nitrate at 50ºC, and estimate the approximate value for the enthalpy of solution of potassium nitrate in water.

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Introduction

Aim

My aim is to find the solubility of potassium nitrate in water at different temperatures and to estimate the solubility of potassium nitrate at 50ºC, and estimate the approximate value for the enthalpy of solution of potassium nitrate in water.

Background Knowledge

Enthalpy is the amount of energy possessed by a thermodynamic system for transfer between itself and its environment.  For example, in a chemical reaction, the change in enthalpy of the system is the heat of the reaction.  In a phase change, as from a liquid to a gas, the change in enthalpy of the system is the latent heat of vaporization.  In a simple temperature change, the change in enthalpy with each degree is the heat capacity of the system at constant pressure.  The German physicist Rudolf J.E. Clausius originated the term in 1850.  Mathematically, enthalpy H is identified as U + PV, where U is internal energy, P is pressure, and V is volume.

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Bibliography

I gathered this information from: Microsoft Encarta ’95 and The Dorling Kindersley.

Equipment List

Electric Scale, Boiling Tube, Burette, Thermometer, Bunsen Burner, Beaker, Black Card, Safety Goggles.

Equipment Diagram

Prediction

I predict that from this investigation

The Results Table That I Will Use

How Am I Going To Make It A Safe Experiment?

In this experiment I will have to make sure everything is done with safely.  

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