Determination of the best set of condition

The major concern is to ensure that only one condition is allowed to vary so that any observed effects can be attributed to that condition.

The first step is to define the reaction conditions that are to remain constant. The values selected are refferred to as the control values. One condition is chosen to be the variable. The reaction is run using all control values except for the variable. The results are analyzed to see what effect the variable condition had on the reaction.

The proper evaluation of a particular condition will require the performance of four reactions.

1. Control reaction: the reaction is performed using the control values for each condition.
2. Blank reaction: the condition to be varied is set to zero.
3. Test 1: reaction in which the varible is asigned a specific value different than the control and the blank reaction values.
4. Test 2: reaction in which the variable is asigned another values different from the three previous reactions.

To How do you compute the Yield

Yield and percent yield

The success of a chemical reaction is determined by computing the yield. The percent yield is a way of comparing how much product was produced during the reaction to how much product should have been produced when looking at the stoichiometry fo the reaction. The formula for percent yield is:

Percent Yield = (experimental yield / theoretical yield) * 100%

• Experimental yield: the amount of product (gram or mole) produced by the reaction.

• Theoretical yield: the amount of product (gram or mole) theoretically obtainable from the amount of the reactants.

The experimental and theoretical yield have to be expressed in the same unit.

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ChemThreads

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