Chemical Reaction Equilibrium
I. Introduction
There are two types of chemical reaction that occur one goes only in one direction and the other one is reversible. A reversible reaction is when a products starts to form the backward reaction starts where the products turns back to reactant molecules. When the rate of forward and backward reaction is already equal and the concentrations of the reactants and products no longer change with time we can say that chemical equilibrium is already achieved. A reaction is said to be at equilibrium when the following conditions exist.
1.
2.
3.
Several factors such as temperature, concentration and pressure affects the rate of reaction which can cause an effect in the chemical equilibrium. A general rule is used to predict the direction in which an equilibrium reaction will move which is called the Le Chatelier’s Principle. It states that if an external stress is applied to a system at equilibrium, the system adjusts in such a way that the stress is partially offset as it tries to reestablish equilibrium. The word “stress” here means a change in concentration, pressure, volume, or temperature that removes a system from the equilibrium state.
II. Procedure
On the first part of the experiment the effect of concentration was tested. Four test tubes was prepared, on the 1st tube 5.0 mL of 0.02M KSCN and 5 ML of distilled water was added then the appearance of the solution was observed. The solution prepared on the 1st tube was then divided into the remaining test tube and tube 1 was used as the reference for comparison. On the 2nd tube small crystal of KSCN was added. On the 3rd tube 1 drop of 0.02M Fe (no3)3 was added. And on the 4th tube 2 drops of 0.02M Nah2PO4 was added. The appearance of the solution on the test tubes was then observed and recorded.
On the second part of the experiment the effect of pressure was tested. Under the fume hood nitrogen dioxide was generated by placing a pinch of NanO2 in a test tube and adding 3-4 drops of 6M HCL. The
There are two types of chemical reaction that occur one goes only in one direction and the other one is reversible. A reversible reaction is when a products starts to form the backward reaction starts where the products turns back to reactant molecules. When the rate of forward and backward reaction is already equal and the concentrations of the reactants and products no longer change with time we can say that chemical equilibrium is already achieved. A reaction is said to be at equilibrium when the following conditions exist.
1.
2.
3.
Several factors such as temperature, concentration and pressure affects the rate of reaction which can cause an effect in the chemical equilibrium. A general rule is used to predict the direction in which an equilibrium reaction will move which is called the Le Chatelier’s Principle. It states that if an external stress is applied to a system at equilibrium, the system adjusts in such a way that the stress is partially offset as it tries to reestablish equilibrium. The word “stress” here means a change in concentration, pressure, volume, or temperature that removes a system from the equilibrium state.
II. Procedure
On the first part of the experiment the effect of concentration was tested. Four test tubes was prepared, on the 1st tube 5.0 mL of 0.02M KSCN and 5 ML of distilled water was added then the appearance of the solution was observed. The solution prepared on the 1st tube was then divided into the remaining test tube and tube 1 was used as the reference for comparison. On the 2nd tube small crystal of KSCN was added. On the 3rd tube 1 drop of 0.02M Fe (no3)3 was added. And on the 4th tube 2 drops of 0.02M Nah2PO4 was added. The appearance of the solution on the test tubes was then observed and recorded.
On the second part of the experiment the effect of pressure was tested. Under the fume hood nitrogen dioxide was generated by placing a pinch of NanO2 in a test tube and adding 3-4 drops of 6M HCL. The