Factors Affecting Rate of a Reaction, Chemistry Design Lab
Chemistry Lab Report
(Design)
Factors affecting Rates of a Reaction (Kinetics)
KINETICS DESIGN LAB
Research Question:
Does the concentration of Potassium Iodide (KI) affect the rate of its reaction with hydrogen peroxide (H2O2) (of a fixed concentration)?
Introduction:
There are several factors that affect the rate of a reaction. Some of them being Pressure (if the reactants are Gases), Temperature, Presence of a Catalyst, Surface Area of the reactant, and Concentration. According to the Collision Theory, during a reaction, particles collide with each other and react if the geometry of the collision is correct. In this Experiment, we will investigate the effect of varying concentrations of Potassium Iodide on its reaction with Hydrogen peroxide, which will stay at a fixed concentration. This reaction may also be known as the ‘Iodine Clock Reaction.’ The rate of the reaction will be measured by timing the reaction between Hydrogen Peroxide, Potassium iodide, and Sodium Thiosulphate. Sodium Thiosulphate is used as a delaying mechanism as the reaction between the two main reactants is too rapid to measure. The Sodium Thiosulphate will react with the Iodine [III] ions (the product) first and when the all the Sodium Thiosulphate has reacted, then the remaining Iodine ions will form a blue-black solution because of the addition of Starch into the solution.
The Ionic Equation for this reaction is:
(aq.) + 2S2O32- (aq.) 3I- (aq.) + S4O62- (aq.)
H2O2 (aq.) + 3I- (aq.) + 2H+ (aq.) + 2H2O (l.)
A stopwatch will be used to measure the time taken for the blue-black color of the solution to completely cover the “X” marked on the tile the conical flask is standing on.
Variables:
Independent Variable: Concentration. (The changing concentrations of Potassium Iodide.)
Dependent Variable: Rate of the Reaction. (The amount of time taken for the blue-black starch complex to cover the ‘X’ marked on the tile.)
Control Variables:
i.
(Design)
Factors affecting Rates of a Reaction (Kinetics)
KINETICS DESIGN LAB
Research Question:
Does the concentration of Potassium Iodide (KI) affect the rate of its reaction with hydrogen peroxide (H2O2) (of a fixed concentration)?
Introduction:
There are several factors that affect the rate of a reaction. Some of them being Pressure (if the reactants are Gases), Temperature, Presence of a Catalyst, Surface Area of the reactant, and Concentration. According to the Collision Theory, during a reaction, particles collide with each other and react if the geometry of the collision is correct. In this Experiment, we will investigate the effect of varying concentrations of Potassium Iodide on its reaction with Hydrogen peroxide, which will stay at a fixed concentration. This reaction may also be known as the ‘Iodine Clock Reaction.’ The rate of the reaction will be measured by timing the reaction between Hydrogen Peroxide, Potassium iodide, and Sodium Thiosulphate. Sodium Thiosulphate is used as a delaying mechanism as the reaction between the two main reactants is too rapid to measure. The Sodium Thiosulphate will react with the Iodine [III] ions (the product) first and when the all the Sodium Thiosulphate has reacted, then the remaining Iodine ions will form a blue-black solution because of the addition of Starch into the solution.
The Ionic Equation for this reaction is:
(aq.) + 2S2O32- (aq.) 3I- (aq.) + S4O62- (aq.)
H2O2 (aq.) + 3I- (aq.) + 2H+ (aq.) + 2H2O (l.)
A stopwatch will be used to measure the time taken for the blue-black color of the solution to completely cover the “X” marked on the tile the conical flask is standing on.
Variables:
Independent Variable: Concentration. (The changing concentrations of Potassium Iodide.)
Dependent Variable: Rate of the Reaction. (The amount of time taken for the blue-black starch complex to cover the ‘X’ marked on the tile.)
Control Variables:
i.