CHEM 1040L Lecture Notes - Lecture 2: Stoichiometry, Redone, Iodine
Experiment Two
Introduction
The objective of experiment two was to determine the molar ratio in which two compounds
react for several reactions, using thermometric titration. This was accomplished by consistently
measuring the temperature of the solution as drops of a given reactant were poured drop by
drop. The stoichiometric point was determined as the MeasureNet system graphed the
progression of the reaction. The concepts that relate to lecture include the use of the mole
ration, reaction stoichiometry, and the use of balanced equations. The lab concepts used in this
experiment consist of the use of a pipet and buret to measure liquid volume, using the drop
counter to count each drop that was added to the solutions, using the hot plate as a stir plate,
and using the temperature probe to measure the temperature of the solutions.
Experimental Procedure
The experimental procedure was downloaded and printed off of Chem21labs. com, titled
Experiment Two: Reaction Stoichiometry by Thermometric Titration. It came from pages 2-6.
The procedures were followed exactly as they were stated in the handout.
Experimental Data
Concentration of NaOCl solution 0.1850
Reducing Agent Concentration of Reducing Agent Volume of Reducing Agent/NaOCL
KI 0.2 5 8.1
Na2S2O3 0.2 5 16.50
Na2SO3 0.2 5 4.0
KNCS 0.2 5 12.2
Mole of NaOCL reacted 0.00149
Moles of KI reacted 0.0010
Mole Ratio, NaOCl/ Ki 1.49
Simplest Whole # Ratio 1.0
Mole of NaOCL reacted 0.00305
Moles of Na2S2O3 reacted 0.0010
Mole Ratio 3.05
Simplest Whole # Ratio 3.0
Mole of NaOCL reacted 0.0074
Moles of Na2SO3 reacted 0.0010
Mole Ratio, NaOCl/ Ki 0.74
Simplest Whole # Ratio 1.0
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Document Summary
The objective of experiment two was to determine the molar ratio in which two compounds react for several reactions, using thermometric titration. This was accomplished by consistently measuring the temperature of the solution as drops of a given reactant were poured drop by drop. The stoichiometric point was determined as the measurenet system graphed the progression of the reaction. The concepts that relate to lecture include the use of the mole ration, reaction stoichiometry, and the use of balanced equations. The experimental procedure was downloaded and printed off of chem21labs. com, titled. The procedures were followed exactly as they were stated in the handout. 2. 0: the temperature of the reaction drops because one of the reactants in the solution has been used up. There could have been many errors made in this lab. One example made in lab was not putting the magnetic bar strip in the solution before having it stirred on the stir plate.