Determination of an Equilibrium Constant 1. What is meant by a reversible reacti

Question

Determination of an Equilibrium Constant

1.    What is meant by a reversible reaction?

2.   True or False :       The numerical value of the equilibrium constant for                        a given reaction only changes if the temperature
                   changes.

3.   Which component of the reaction mixture was it that was titrated with
   sodium hydroxide?

   A.   Acetic acid           B.   Isopropyl alcohol

   C.   Water               D.   Phenolphthalein

4.   Why was it necessary to wrap your rubber stopper in plastic wrap?

5.   Why was it necessary to titrate a blank sample solution, that is, a sample
   of distilled water which contain only sulfuric acid?

6.   List two advantages of using a buret for measuring reaction volumes as
opposed to maybe a graduated cylinder. (Precision and accuracy are not exceptable answers)

7.   What is a catalyst and how and why was a catalyst needed in this
   experiment?

8.   When would you want to use a pipet instead of a buret in an experiment?

Explanation / Answer

1.    What is meant by a reversible reaction?

reversible reacitons are those theoretical reacitons that could be reversed

that is

reactants ---> products

and now products --> reactants

In real life, ther eis only partial reversible reactions

2.   True or False :       The numerical value of the equilibrium constant for a given reaction only changes if the temperature changes. Since this is a CONSTANT and will not change with concentrations/pressures. only with Temperatures

3.   Which component of the reaction mixture was it that was titrated with
   sodium hydroxide?

   A.   Acetic acid         B.   Isopropyl alcohol

   C.   Water               D.   Phenolphthalein

Typically we titrate acids with bases; all other are compontents used to aid the titraitons

4.   Why was it necessary to wrap your rubber stopper in plastic wrap?

To avoid gas leak

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