Determining the Mole Ratios in a Chemical Reaction
CHM 266, Section 55
Shanel Warren
Tiffany, Princess, and Wei
October 2, 2013
Determining the Mole Ratios in a Chemical Reaction
Introduction The purpose of this lab was to determine the mole ratios of the reactants hypochlorite ion (OCI ) and thiosulfate (S O ) when reacted in a chemical reaction. A chemical equation gives the mole ratios of the reactants and products involved in the chemical reaction. When some formulas of the products are not known, experimental measurements can be made to determine those ratios. During this reaction, hypochlorite ions oxidize the thiosulfate ions according to the unbalanced and incomplete reaction below. A OCI + B S O products The reactions are all exothermic, so the heat produced will be directly proportional to the amount of reaction that occurs. There’s an objective of this experiment and its
• Measure the enthalpy change of a series of reactions
• Determine the stoichiometry of an oxidation-reduction reaction in which the reactants are known but the products are unknown
Materials
• Lab Quest
• Lab Quest App
• Temp. Probe
• Two 10mL graduated cylinders
• Two 25mL graduated cylinders
• Two 50 mL graduated cylinders
• Three 250mL beakers
• 0.50 M sodium hypochlorite, NaOCI
• 0.50 M sodium thiosulfate, Na S O
• 0.2 M sodium hydroxide, NaOH
• Styrofoam Cups
Procedure
Submitted as the carbon-less copy of the pre-lab outline (see attached)
Results and Discussion During this experiment we first, prepared the solutions of the reactants in which the concentrations are known. Second, we mixed the solutions a number of times using different ratios of reactants. Third, the change of temperature is the property that needs to be measured. All the reactions are all exothermic, so heat that’s produced will be directly proportional to the amount of reaction that occurs. The experiment was designed so that the volume of solution is a constant
Shanel Warren
Tiffany, Princess, and Wei
October 2, 2013
Determining the Mole Ratios in a Chemical Reaction
Introduction The purpose of this lab was to determine the mole ratios of the reactants hypochlorite ion (OCI ) and thiosulfate (S O ) when reacted in a chemical reaction. A chemical equation gives the mole ratios of the reactants and products involved in the chemical reaction. When some formulas of the products are not known, experimental measurements can be made to determine those ratios. During this reaction, hypochlorite ions oxidize the thiosulfate ions according to the unbalanced and incomplete reaction below. A OCI + B S O products The reactions are all exothermic, so the heat produced will be directly proportional to the amount of reaction that occurs. There’s an objective of this experiment and its
• Measure the enthalpy change of a series of reactions
• Determine the stoichiometry of an oxidation-reduction reaction in which the reactants are known but the products are unknown
Materials
• Lab Quest
• Lab Quest App
• Temp. Probe
• Two 10mL graduated cylinders
• Two 25mL graduated cylinders
• Two 50 mL graduated cylinders
• Three 250mL beakers
• 0.50 M sodium hypochlorite, NaOCI
• 0.50 M sodium thiosulfate, Na S O
• 0.2 M sodium hydroxide, NaOH
• Styrofoam Cups
Procedure
Submitted as the carbon-less copy of the pre-lab outline (see attached)
Results and Discussion During this experiment we first, prepared the solutions of the reactants in which the concentrations are known. Second, we mixed the solutions a number of times using different ratios of reactants. Third, the change of temperature is the property that needs to be measured. All the reactions are all exothermic, so heat that’s produced will be directly proportional to the amount of reaction that occurs. The experiment was designed so that the volume of solution is a constant