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Chapter 4: Q30P (page 93)

Explain the following statement: "The validity of a chemical analysis ultimately depends on measuring the response of the analytical procedure to known standards."

Short Answer

Expert verified

The given statement should be accepted.

Step by step solution

01

Analytical procedure response

When an analytical procedure responds correctly to a known standard, then it is accepted as a valid analytical procedure for chemical analysis.

02

Explanation of the given statement

The response of an analytical procedure while measuring an analyte of a known quantity has to be done first before the use of the procedure to measure an unknown.

Hence, we have to measure the pure form of an analyte to use it as a calibration standard.

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Most popular questions from this chapter

Repeat Problem 4-7 but use the values 50, 100, and 150 for the standard deviation. Superimpose all three curves on a single graph.

Consider the least-squares problem in Figure 4-11.

(a) Suppose that a single new measurement produces a yvalue of 2.58. Find the corresponding xvalue and its standard uncertainty, ux.

(b) Suppose you measure yfour times and the average is 2.58. Calculate uxbased on four measurements, not one.

(c) Find the 95%confidence intervals for (a) and (b).

For the numbers 116.0,97.9,114.2,106.8and 108.3, find the mean, standard deviation, standard uncertainty ( = standard deviation of the mean), range, and 90% confidence interval for the mean. Using the Grubbs test, decide whether the number 97.9should be discarded.

Excel LINEST function. Enter the following data in a spreadsheet and use LINEST to find slope, intercept, and standard errors. Use Excel to draw a graph of the data and add a trendline. Draw error bars of±syon the points.

x:3.010.020.030.040.0y:-0.074-1.411-2.584-3.750-5.407

Should the value 216 be rejected from the set of results 192,216,202,195, and 204?
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