 ﻿Name

Laboratory Partner Name(s)

Thermodynamics, Enthalpy of Reaction Lab

March 27, 2014

I. Goal

The purpose of this kind of lab is usually to learn how to decide the heat of reaction.

II. Safety

1 . Use appropriate security attire (goggles, aprons, curly hair tie, etc . ). installment payments on your Do not straight inhale or ingest chemical substances.

3. Understand safety details regarding the chemicals being handled during the laboratory (hydrochloric acid, sodium hydroxide). 4. Be familiar with how to run all laboratory equipment.

5. Clean hands and experimentation region before exiting the lab. six. Listen for any additional path from the trainer.

III. Pre-lab Questions

1 ) Define ΔHrxn.

ΔHrxn is definitely enthalpy of goods – reactants. (ΔHrxn sama dengan Hprod-Hreact). 2 . In today's lab you will be applying 50. 0 mL of two. 0 M HCl. Employing Equation a few (M=mol/L) from above, calculate the amount of moles of acid used.

M=mol/L � 2 . 0M = by / 0. 0500L � x = 0. 12 mol HCl

3. You will additionally be using 50. 0 mL of 2. zero M NaOH. How various moles of base are being used?

M=mol/L � 2 . 0M = back button / 0. 0500L � x sama dengan 0. 15 mol NaOH

4. The particular heat of the solution is usually 4. 18 J/g ºC. The solution is by merging 25. zero g of solution A with twenty-five. 0 g of option B, with each answer initially for 21. 4ºC. The final temperatures of the mixed solutions is definitely 25. 3ºC. Calculate the qsol employing equation 1 (qsol = grams of solution x specific heat of answer x ΔT). Answer in kJ.

queen = mCΔT � queen = (50. 09)(4. 18J/g ºC)(3. 9ºC) � 0. 82kJ

five. What is the qrnx?

-qsol = qrnx � -0. 82 kJ

six. If the reaction described in #4 applied 0. 15 moles of B, compute ΔHrxn simply by dividing kJ by moles.

ΔHrxn = -0. 82 kJ / 0. 15 mol � ΔHrxn = -5. 5 kJ/mol

4. Procedures

Measure 50. 0 mL of your 2 . zero M HCl solution within a graduated canister prior to copying to the calorimeter, making sure to record the temperature with the HCl remedy in the info table. After that, rinse the graduated cylinder with distilled drinking water before measuring 50. zero mL of your 2 . zero M NaOH solution, making sure to record the...

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