Percentage Yield (GCSE Chemistry)
Percentage Yield
Percentage Yield of A Reaction
When we perform a reaction, we cannot always get 100% of the calculated amount of product. There are a few reasons for this:
- The reaction can be reversible, meaning that the products get converted back into the reactants.
- Some of the product can get lost when separated from the reaction mixture.
- Some of the reactants may react in ways that we do not expect and not forming the products that we expect.
Key Terms
When we carry out reactions, we want to obtain a product at the end. Sometimes, we measure the amount of product that we gain, which is known as the yield.
Here are three key definitions that you need to be familiar with:
- Yield. The yield of a reaction is the mass or amount of product which is produced in a chemical reaction.
- Percentage yield. The yield of a reaction expressed as a percentage, comparing the real mass of product produced by the reaction with the calculated mass produced.
- Theoretical yield. The calculated mass of the product which is predicted to be produced. It is a theoretical mass worked out from the balanced symbol equation.
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