Topic 3 Percentage yield Flashcards
Does the percentage yield tell you
The overall success of an experiment
What do percentages yields compare
Is compares what do you think you should get (theoretical yield) with what you get in practice (actual yield)
What Is yield
The amount of product you get
What is the percentage yield formula
Percentage yield = mass of product actually made / Maximum theoretical product x 100
What is percentage yield always between
Zero and 100%
What does 100% yield mean
You’ve got all the products you expected
What is 0% yield mean
No reactions were converted into products
Why should industrial processes have as high percentage is possible
To reduce waste and reduce cost
What are yields always less than
Hundred percent
Why are percentage yield always below 100%
Not all reactants react to make products
They might be side reactions
You lose some products when you separate it from the reaction mixture
Why do not all reactants make a product
In irreversible reaction is the products can turn back into reactions yield will never be hundred percent
Side reactions
The reactions sometimes react differently to how you expect
they might react with gases in the air or impurities in the reaction mixture so they end up forming extra products
Why won’t you lose some products when you separate it from the reaction mixture
When you feel for a liquid to move solid particles you nearly always lose a bit of a liquid or solid
If you want to keep this liquid you lose remains of a solid
If you want to keep this solid some of it will get left behind when you scrape it off the filter paper
May also lose a bit of material when you transfer it from container to another
