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Determining ΔHrxn for the Reaction of Lead(II) Nitrate and Sodium Iodide in a Calorimeter

This experiment utilizes a coffee cup calorimeter to measure the heat exchanged during the reaction between lead(II) nitrate and sodium iodide, which produces lead(II) iodide and sodium nitrate. A 6.00-gram sample of sodium iodide is mixed with 200 mL of a 0.22 M lead(II) nitrate solution. Initially, the temperature of the solution is 22.6°C and rises to 24.2°C after the reaction. Using the specific heat and density of water for calculations, we will find the enthalpy change (ΔHrxn) for the reaction.

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Determining ΔHrxn for the Reaction of Lead(II) Nitrate and Sodium Iodide in a Calorimeter

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  1. A coffee-cup calorimeter is used to measure the heat exchanged when the following reaction is performed : Pb(NO3)2 + 2 NaI(aq) → PbI2(s) + 2 NaNO3(aq) Specifically… A 6.00-gram sample of sodium iodide is added to 200 mL of a 0.22 M lead(II) nitrate solution. Before the solid is added, the solution has a temperature of 22.6˚C. The temperature is recorded to be 24.2˚C when the reaction is complete. Use this information to determine the ΔHrxn. Assume that the specific heat and density of the mixture are the same as that for pure water.

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