CaO(s) + CO2(g) → CaCO3
CaCO(s) +2HCL(aq) ) →CaCl2(aq)+H2O(I) +CO2(g) ∆H-31kJmol-1
CaCO(s) +2HCL(aq) ) →CaCl2(aq)+H2O(I) ∆H1=
-59KJmol
Use the energy cycle and your answers from question 3 to determine the enthalpy change of the reaction CaO(s) + CO2(g) → CaCO3(s) for one mole of calcium carbonate.
Using Hess law
∆H= ∆H-∆H
(31kJmol)-( -59KJmol)
=28KJmol
Conclusion: The heat of reaction for the decomposition of calcium carbonate was found to be ________________carbon dioxide and Calcium Oxide.________
Limitations:
Insulate container ensure that there is little or no energy loss to the outside or that energy is not getting in either.
Heat release is not fully captured limiting the results.
B elair High School
Subject: CAPE Chemistry Unit 1
All You Need to Know!
Name: _________Abbyshay Gayle_______________
Lab Write-up
Date: ___/___/___ Lab No. 5
Module: 2 Rates of Reaction Skills tested: A&I and M&M
Aim: To determine the effect of concentration on reaction rate.
Apparatus/Materials: Measuring cylinder, conical flask, stop watch, cross on sheet of paper.
Reagents: Sodium thiosulphate (Na2S2O3), sulphuric acid (H2SO4), water (H2O)
Method/ Procedure:
20cm3 of thiosulphate solution was placed in the flask.
20cm3 was of hydrochloric acid was added and then the stop watch was started.
The flask wasQ2Swir to mix the liquids and it was placed over the paper.
It was looked vertically down through the liquid and it was noted how long it took for the cross to disappear.
The experiment was repeated using16, 12, 8 and 4 cm3 of thiosulphate solution that was made up each time to 20 cm3 of water.
Results: Plot a graph of the concentration of the thiosulphate in moldm-3 against time for the reaction
Plot a graph of the concentration of the thiosulphate in moldm-3 against 1/time for the reaction
TABLE SHOWING RESULTS OBTAINED FROM RATE OF REACTION EXPERIMENT
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