Question

To determine the heat of solution of potassium nitrate

Answer 1

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Divide the heat absorbed (in kJ) by the moles of potassium nitrate dissolved. This is the heat of solution, expressed in kJ/mol of solute. 4. Using the known value of the heat of solution of potassium nitrate (see first page of this lab) calculate the absolute error in your experimental result.

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Answer 2

The heat of solution of potassium nitrate can be determined experimentally through calorimetry.

• Calorimetry is the study of heat transfer and energy changes during chemical reactions or physical processes.
• In this case, the heat of solution of potassium nitrate can be determined by measuring the heat transfer that occurs when a known mass of potassium nitrate is dissolved in a known volume of water at a constant temperature. The heat transfer can be measured using a calorimeter, which is an insulated container that can accurately measure small changes in temperature.
• To perform the experiment, the initial temperature of the water in the calorimeter is recorded, and then a known mass of potassium nitrate is added to the water. The temperature change that occurs during the dissolution of the potassium nitrate is then measured and recorded.
• The heat of solution of potassium nitrate can then be calculated using the equation:
• q = mcΔT
• where q is the heat transfer, m is the mass of potassium nitrate, c is the heat capacity of the water, and ΔT is the change in temperature of the water.
• The heat of solution of potassium nitrate is an important physical property that can be used to predict and understand the behavior of aqueous solutions of this salt.

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