Which veriable should he change, measure and control (temp of water, volume of water and mass of sodium chloride that dissolve )
in a dissolving investigation
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I would assume so.
Given
, we can simplify the fraction to 
Both would obtain the same proportions, so I don't see why putting a half cup of sugar would make things any different.
Hope this is the answer you are looking for.
Given
Both would obtain the same proportions, so I don't see why putting a half cup of sugar would make things any different.
Hope this is the answer you are looking for.