Chapter 28: Q1TY (page 773)
If 105 particles are taken, what is the relative standard deviation of each measurement?
Short Answer
The relative standard deviation for KCl and KNO3 particles will be 3.15% and 0.032% respectively.
Chapter 28: Q1TY (page 773)
If 105 particles are taken, what is the relative standard deviation of each measurement?
The relative standard deviation for KCl and KNO3 particles will be 3.15% and 0.032% respectively.
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Get started for freeBarbital can be isolated from urine by solid-phase extraction with\({{\bf{C}}_{18}} - \)silica. The barbital is then eluted with\({\bf{1}}:{\bf{1}}\) vol/volacetone: chloroform. Explain how this procedure works.
In an experiment analogous to that in Figure 28-3, the sampling constant is found to be \({K_{\rm{s}}} = 20\;{\rm{g}}.\)
(a) What mass of sample is required for a \( \pm 2\% \)sampling standard deviation?
(b) How many samples of the size in part (a) are required to produce \(90\% \)confidence that the mean is known to within\(1.5\% \)?
To pre-concentrate cocaine and benzoylecgonine from river water described at the opening of thischapter, solid-phase extraction was carried out at
Why is it advantageous to use large particles \(\left( {{\bf{50}}{\rm{ }}\mu {\bf{m}}} \right)\) for solid phase extraction, but small particles \(\left( {{\bf{5}}{\rm{ }}\mu {\bf{m}}} \right)\) for chromatography?
Referring to Table 28-7, explain how an anion-exchange resin can be used for absorption and analysis of \({\bf{S}}{{\bf{O}}_2}\)released by combustion.
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