college chemistry

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a student did an alkalinity determination correctly,except that the sample titrated had a volume of 90.0 mL. Volume A was found to be 4.50 mL and Volume B was 7.00 mL. 1)Calculate the Alkalinity value from these data and then calculate the correct value.2)what percent error would there be in the student's determination in (a)
3) would there have been an error in the classification of the stream? explain concisely.

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