1) Incomplete reactions- if not all the reactants are converted to product, the reaction is incomplete and the yield will be lower than expected.
2) Practical losses during preparation- you always lose a bit when you transfer chemicals from one container to another. Think about transferring a liquid to a new container- some of it always get left behind.
3) Unwanted reactions- things don't always go exactly to plan. Sometimes you get unexpected reactions happening, so the yield of the intended product goes down. There an be caused by imurities in the reactants, but sometimes just changing the reaction conditions affects what products you make.
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