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Introduction to Analytical Chemistry

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Questions and Answers

What is the absolute error in the measurement of the mass of a copper reagent?

0.01 g

2.62 g

0.11 g (correct)

2.51 g

What is the relative error in the measurement of the mass of a copper reagent?

2.1%

4.2% (correct)

8.4%

10.2%

What is the formula for calculating the absolute error?

|V1 - V2| (correct)

V1 + V2

V2 - V1

V1 - V2

What is the purpose of calculating the relative error?

To express the absolute error as a percentage of the true value Signup and view all the answers

What is the standard deviation a measure of?

The amount of variation of a random variable about its mean Signup and view all the answers

What is the purpose of calculating the standard deviation in the example of the glucometer?

To understand the variation of the blood glucose levels Signup and view all the answers

What is the main goal of analytical chemistry?

To characterize the chemical composition of matter Signup and view all the answers

What is the main difference between determinate and indeterminate errors?

Determinate errors are systematic, while indeterminate errors are random Signup and view all the answers

What is the purpose of statistical analysis in analytical chemistry?

To set limits on each step of analysis and understand the significance of the data Signup and view all the answers

What is the absolute error?

The difference between the true value and the measured value, with regard to the sign Signup and view all the answers

What is the main purpose of minimizing experimental error?

To minimize the impact on the accuracy of the results Signup and view all the answers

What is the main application of analytical chemistry in the pharmaceutical industry?

Quality control of medicinal products Signup and view all the answers

What is the relative standard deviation (RSD) typically expressed as?

A percentage of the mean Signup and view all the answers

What happens to the errors in individual numbers when a series of calculations are performed?

They are propagated Signup and view all the answers

When performing addition and subtraction, how are absolute uncertainties handled?

They are additive Signup and view all the answers

When performing multiplication and division, how are relative uncertainties handled?

They are additive Signup and view all the answers

What is the most probable error represented by in the case of addition and subtraction?

The square root of the sum of the absolute variances Signup and view all the answers

What is the uncertainty in the volume of the solution in the example given?

±0.32 mL Signup and view all the answers