calioremetry2 - Trevor Nestor Period 2 C.P. Chemistry March...

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Trevor Nestor Period 2 C.P. Chemistry March 24, 2009 Santa Susana High School Determining the change in enthalpy and molar heat of solution for the dissolving of different salts in water through the use of solution calorimetry to explore calorimetry Introduction In this investigation the change in enthalpy will be determined for the dissolving of various salts in water. Enthalpy, or the heat content of a system, is expressed in kilojoules, and is symbolized by H. Change in enthalpy is symbolized by H. Calorimetry, or the measure of heat flow in to or out of a system, is used primarily to measure the energy content of samples such as foods. (Tatum, 2009) (Doherty, 2009). To find change in enthalpy, measurements will be taken through the use of a calorimeter. A calorimeter is an apparatus that records changes in temperature that occur as chemicals react in water. Chemicals that react in water make up a system. The water in which chemicals react make up surroundings. To calculate heat absorbed by surroundings, the equation “ m x C x Τ ” can be used where “ m ” is defined as mass of water, “C” is defined as specific heat of water, and “ ” is defined as final temperature recorded minus initial temperature recorded. Heat absorbed by surroundings is often symbolized as q surr. The heat released by a system is identical to heat absorbed by surroundings, but with the opposite sign (negative or positive). Heat released by a system is the same as change in enthalpy, and therefore, H (change in enthalpy) = q sys (heat released by a system) = - q surr (negative of the value of heat absorbed by surroundings) = - m x C x Τ. Molar heat of solution, expressed in kilojoules per mole and symbolized as H soln , is change in enthalpy, but is, as before mentioned, expressed per mole. (Katz, 2009) (Wilbraham et al, 2007). 1
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In this investigation with potentially dangerous chemicals will be used and safety precautions will therefore be taken. In this investigation, the salts Sodium Hydroxide (NaOH), Sodium Iodide (NaI), and Sodium Chloride (NaCl) were selected to be tested. Sodium Hydroxide is corrosive, can cause serious burns, and is harmful is ingested, inhaled, or directly
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calioremetry2 - Trevor Nestor Period 2 C.P. Chemistry March...

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