Structure: Aim and Hypothesis

If you have been keeping good laboratory notes you will already have kept a record of your aims and, if appropriate, your hypothesis(es). In other words, you will already have enough information to write that stage of the introduction. Typically, your introduction will lead up to a statement of your aim and/or hypothesis.

In your lab notes, you write your aim as a phrase: - to find the conditions favouring production of large uniform crystals of ammonim sulfate in an elutriating evaporating rig.
When you write the introduction to your lab report, you need to change this to a sentence: This experiment was carried out to find the conditions favouring production of large uniform crystals of ammonim sulfate in an elutriating evaporating rig.
You can also write out your aim as a hypothesis or set of hypotheses: It was expected that large seed would produce a smaller yield of crystals with larger size as growth would occur on the crystal seeds.
Notice that the hypothesis and aim are typically (but not always) expressed in the PAST TENSE: The hypothesis was that .....
The aim was to ....
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