In a solution the solute is dissolved by the solvent.
Blanks are made using the same solvent used in your solutions. So, in this case, you would use 80 percent acetone in water. Blanks allow you to see what parts of your results are due to the solvent and what parts are due to the solute. If you used pure water as your blank, it would not show the effect of the 80 percent acetone in water on your results.
It would not be correct to blank the spectrophotometer with deionized water because deionized water does not contain any solutes that would contribute to the absorbance reading. The purpose of blanking the spectrophotometer is to zero the instrument by measuring the absorbance of a solution that only contains the solvent used in the sample. Using deionized water would not effectively remove any background interference from the sample, leading to inaccurate results. It is recommended to use a blank solution that closely matches the solvent and conditions of the sample being measured.
The blank titration is used to determine the exact amount of acid needed to neutralize any impurities in the titration setup, such as the indicator and solvent. This additional volume of acid is accounted for in the blank titration and is subtracted from the volume of acid used in the titration with the oil sample.
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It is called a solvent, the substance being dissolved is a solute.
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