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Question 1
There are exothermic and endothermic reactions, depending on if it either releases or absorb energy from the
surroundings. This energy comes in the form of heat, which we can observe as a change in the temperature.
Mathematically we can express this change as:
𝑞 = 𝑚 × 𝐶 × ∆𝑇
Also, this heat, or energy, is the change of enthalpy of the system. Therefore:
∆𝐻 = �...
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Date: May 30, 2019Class: Chemistry HonorsAssignment Title: Unit 5 Virtual Lab: Determining the Heat of Reaction in Aqueous SolutionQuestion:1.Can you measure the reaction between reagents A and B combined?2.Can you create two solutions that mixed together result in a temperature of 50 degrees?Hypothesis:A.I believe I can measure the reaction between both regents A and B combined using the onlinevirtual lab.Procedure:Use the lab to measure Delta Ho for the reaction that occurs when reagents A and B arecombinedPlease note that each prepared flask contains 100 mL of solution. Also, you may assumethe heat capacity of the aqueous solutions is equal to the heat capacity of water 4.18 J/gKoPlease describe your complete procedure and the key quantities you measure. Points arebased upon your final answer and whether or not you explain your procedure in sufficientdetail for us to reproduce your actions. You are not graded on the method you used: allapproaches that meet the above goal are equally valid.Using water and the reagents provided in the lab, create two solutions such that when youmix equal amounts together, the resulting solution has an initial temperature of 50o C.Observations and Results:Use the lab to measure Delta Ho for the reaction that occurs when reagents A and B arecombined: A + B ==> CThere are exothermic and endothermic reactions, depending on if it either releases or absorbenergy from the surroundings. This energy comes in the form of heat, which we can observe as achange in the temperature. Mathematically we can express this change as:q=m×C ×∆TAlso, this heat, or energy, is the change of enthalpy of the system. Therefore:∆ H=m×C ×∆T=m ×C ×(T2−T1)
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Experimental Organic Chemistry: A Miniscale & Microscale Approach
Gilbert/Martin
Expert Verified
Where m: mass of the solution; C: Heat capacity of waterWe can determine the enthalpy of the reaction following the next steps:Take 1M solution of A and 1M solution of B, taking note of their initial temperatures (T1)Take an empty Erlenmeyer flask and drop all of solution A into it.Thermally insulate this flask at the same temperature as flasks of reagents A and B (25°C)Drop solution of reagent B into this flask, taking note of its temperature (T2)
The total mass of the solution is 200g (since we could assume its density is the same as water).
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