CHEM 1211L Lab Manual-Page 115 Hess\'s Law released b two for In this experiment

Question

CHEM 1211L Lab Manual-Page 115 Hess's Law released b two for In this experiment, you will use a Styrofoam-cup calorimeter to measure the heat y reactions 2a and 2b from the pre-lab. You will use the enthalpies of these e the enthalpy of reaction reaction 4. This concept is sometimes referred to as the additivity of heats of reaction. The primary objective of this experiment is to confirm the validity of this law and use it to calculafe the heat of combustion for magnesium. PROCEDURE You will use two er as a calorimeter, as shown in Figure 1 or purposes of this experiment, you may assume that the heat loss to the calorimeter and the surrounding air is negligible. Even if heat is lost to either of these, it is a airly constant factor in each part of the experiment, and has little effect on the final results. Dilution of hydrochloric acid 1. Available in the lab is a 6.0 M HCI solution. You need to make 100 mL of 1.0 M HCI. Write a detailed procedure on how to make this dilution in the space provided. Get your instructor's approval before proceeding. Show all of your calculations on the data sheet. Figure 1 (e.om)Cr) (1.0H)(100 ml) Instructor's Initials Reaction 1- Magnesium metal with aqueous HCI 2. Place two Styrofoam cups one inside the other into a 250-mL beaker, as shown in 3. Measure out 50.0 mL of the 1.0 M HCI you made into the Styrofoam cup. Lower the 4. Follow the instructions provided in your lab manual (Logger Pro Directions) to Figure 1. You will not need the ring stand and clamp temperature probe into the solution and allow it to rest on the side of the cup. connect the temperature probe and LabPro to the computer and run the program. The experiment set up can be found under the Hess' Law folder. The vertical axis should have the temperature scaled from 15 C to 30°C. The horizontal axis should

Explanation / Answer

the reaction involving Mg with HCl. Mg (s) + 2 H+ (aq) Mg2+ (aq) + H2 (g)

the reaction involving MgO and HCl. MgO (s) + 2 H+ (aq) Mg2+ (aq) + H2O (l)

the reaction involving Mg2+ with H2O. Mg2+ (aq) + H2O (l) MgO (s) + 2 H+ (aq)

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