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Briefly explain why the NaOH solution must be prepared using the same solvent mixture as is...

Briefly explain why the NaOH solution must be prepared using the same solvent mixture as is used in the reaction flask

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Briefly explain why the NaOH solution must be prepared using the same solvent mixture as is used in the reaction flask

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It is not clear in this question what is the purpose of the NaOH solution, but if you are making an analysis it is a standard procedure to use the same solvent mixture that you are using in the sample. In this way the base or matrix where the reaction takes place has the same influence or interference with the standard and with the sample.

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