Molar fondness of Solution
INTRODUCTION
Background:
The dissolution of any ionic ticker in water is always accompanied by the energy or enthalpy variegate. A answer in which energy is released to the milieu is called an exothermic reaction. In this type of reaction the enthalpy is start for the products than for the reactants. A reaction in which energy is absorbed from the milieu is called an endothermic reaction. In endothermic reactions the enthalpy of the products is greater than that of the reactants.
hydrogen is the total energy content of the reacting materials. It is given the symbol H. total heat layaboutnot be beatnikd as such, but it is possible to measure the enthalpy change when energy is transferred to or from a reaction system and changes from one enthalpy to another. When reaction occurs at ageless pressure, the heat of reaction is equal to the enthalpy change. So it is unmixed that the value of ?H depends on the specific reaction that has taken place, the amounts of the substance involved and temperature change.
Therefore the energy change can be calculated by using the equation:
?H=-mC?T
Where: ?H is the chemical energy released or absorbed (Joules, J)
m is the mass of the solution being heated or cooled (grams, g)
C is specific heat capacity (J/g K)
?T is the temperature change (K or Co)
Hypothesis:
The attend to is exothermic and ?H is nix when there is clear evidence of heat release and temperature increase.
The process is endothermic and ?H is positive when the heat is absorbed and temperature decreases.
condition: To determine the molar heat of solution of an unknown substance (kJ/mol) by designing experiment and using calorimeter.
Materials:
Styrofoam cups
Thermometer
Measuring cylinder
electronic balance
Unknown substance (CaCl2)
Glass stirrer
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