Overall Theory/Research Question investigating: To
what extent is the statement ‘like dissolves like’ true?
Part 1 Working Hypothesis: If the temperature of the water and either one
of the four other substances is increased, then the solubility and/or the rate
of solubility of that substance in water will increase.
Part 2 Working Hypothesis: If substances are mixed together over heat
before being added to water, the hydrocarbons and alcohols will mix along with
the alcohol and salt, whereas the salt and oil will not mix, though the salt
will still dissolve in water.
Part 3 Working Hypothesis:
The addition of both the liquid soap and dishwashing fluid will cause
all substances to dissolve in water, however, the dishwashing liquid will be
more effective in increasing solubility.
Your basic idea is OK but this is a huge task which risks being only a cursory coverage. You may need to consider concentrating on one small aspect of it and to investigate that thoroughly.
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