1.

Fe(NO3)3 + 3KCNS → Fe(CNS) + 3KNO3 This balanced chemical equation is wrote on the black board when the teacher is going to conduct an experiment on chemical equilibrium.a. In the above reaction, which chemical has red color. b. Fe(NO3)3 , KCNS combined together, put it on the test tube stand, is there any col our change? Is the color is diminishing while it kept in test tube stand? c. Convert the solution reared into four be a kers dilute each with equal amount of water. In the first beaker add Fe(NO3)3 , in the second one KCNS, in the third KNO4 like wise. Compare the color change with the fourth beaker. Find out the reason. d. Point out the characteristics of equilibrium based on the experiment done. e. In minute level chemical equilibrium is Kinetic energy why? f. How and when a reversible reaction attains chemical equilibrium.g. In the graph given below, when the reactant and product attain the level A? What are the characteristics of the point A?

Answer»

a. Fe (CNS), (Ferric Thiocyanate) 

b. Yes, Red color increases 

c. 

  Activity Performed   Observations  Reason
Added Fe (NO3)3Red color of solution intensifiesFe (NO3)3 reacted with the remaining KCNS to form the product
Added KCNSThe red color of solution intensifiesKCNS reacted with remaining in the solution to form more product
Added KNO3Intensity of the red color of the solution is reduced significantlyThe product Fe (CNS), is reacted with KNO to form reactants.

d. At equilibrium both the reactants and products coexist. 

  • The rates of forward and backward reactions become equal at equilibrium. 
  • Chemical equilibrium is dynamic at the molecular level. 
  • The system can attain equilibrium even when the concentration of the reactants and products are not equal. Once equilibrium has been attained, there will be no change in the concentration of reactants as well as that of products. 
  • Chemical equilibrium is attained in closed system.

e. Even in equilibrium state reactants, molecules form products and products form reactants. Hence in minute level chemical equilibrium is kinetic energy. 

f. The concentration of reactants and products do not change a reversible reaction attain chemical equilibrium, 

g. A is the point at which the rates of both forward and backward reactions become equal. 

At equilibrium both the reactants and products coexist.


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