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.
http://sorrel.humboldt.edu/~emc7001/ERE350/alk&hardness.html
To calculate the alkalinity value, we need to use the following formula:
Alkalinity = (Volume B - Volume A) * Normality of the titrant
1) Given that Volume A is 4.50 mL and Volume B is 7.00 mL, we can calculate the alkalinity value as follows:
Alkalinity = (7.00 mL - 4.50 mL) * Normality
To calculate the correct value, we need to consider the incorrect sample volume of 90.0 mL. The correct value can be found using the following formula:
Correct Value = (Alkalinity value * Incorrect Sample Volume) / Correct Sample Volume
Let's calculate the alkalinity value and the correct value:
Alkalinity = (7.00 mL - 4.50 mL) * Normality
To calculate the correct value, we need the correct sample volume. Unfortunately, the question does not provide the correct sample volume. Therefore, we cannot calculate the correct value without that information.
2) The percent error in the student's determination can be calculated using the following formula:
Percent Error = (|Experimental Value - Accepted Value| / Accepted Value) * 100
In this case, the experimental value is the alkalinity value calculated by the student, and the accepted value is the correct value (which we cannot determine without the correct sample volume).
To calculate the percent error, we need the correct value. Without that information, we cannot determine the percent error.
3) To determine if there was an error in the classification of the stream, we need to compare the alkalinity value with the accepted range or threshold for classifying the stream.
Unfortunately, the question does not provide information about the accepted range or threshold for classification. Without that information, we cannot conclusively determine if there was an error in the classification of the stream.