How much iron ore (that assays at 10.18% Fe) must be used in an analytical procedure that is known to have a low bias of −0.15 g if an overall relative error of 0.48 ppth in the iron content is desired?
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Q: How much iron ore (that assays at 16.54%16.54% Fe)Fe) must be used in an analytical procedure that…
A: Given data: 16.54% Fe The low bias = -0.15g An overall relative error = 2.26 ppth
How much iron ore (that assays at 10.18% Fe) must be used in an analytical procedure that is known to have a low bias of −0.15 g if an overall relative error of 0.48 ppth in the iron content is desired?
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- how much iron ore (that assays at 33.8% fe) must be used in an analytical procedure that is known to have a low bias of -0.15g if an overall relative error of 2.09 ppth in the iron content is desiredHow much iron ore (that assays at 16.54%16.54% Fe)Fe) must be used in an analytical procedure that is known to have a low bias of −0.15 g if an overall relative error of 2.26 ppth in the iron content is desired?If an instrument gives a response of 1240 for a standard containing 8 ppm of a substance, how much if this substance is in a sample that gives a response of 1705? Are any assumptions needed?
- Which sentence is false about gravimetric analysis? a. It is used for inorganic b. It is used to assay barium c. It is used to assay of d. Relative precision 3% to 4%Which of the following characteristics of a reversed – phase chromatography? I. The stationary phase is polar II. The mobile phase is more polar than the stationary phase III. A less polar mobile phase has a lower eluent strength IV. A more polar mobile phase has a higher eluent strength V. The stationary phase is nonpolar a) I & III b) I & IV c) II & IV d) II & V e) II onlyOne method for the quantitative determination of the concentration of constituents in a sample analyzed by gas chromatography is area normalization. Here, complete elution of all the sample constituents is necessary. The area of each peak is then measured and corrected for differences in detector response to the different eluates. This correction involves dividing the area by an empirically determined correction factor. The concentration of the analyte is found from the ratio of its corrected area to the total corrected area of all peaks. For a chromatogram containing three peaks, the relative areas were found to be 16.4, 45.2 and 30.2, in order of increasing retention time. Calculate the percentage of each compound if the relative detector responses were 0.60, 0.78 and 0.88, respectively.
- A gas chromatogram of a mixture of toluene and ethyl (a) Measure w1/2 for each peak to the nearest 0.1 mm. When the thickness of the pen trace is significant relative to the length being measured, it is important to take the pen width into account. It is best to measure from the edge of one trace to the corresponding edge of the other trace, as shown at the bottom of the left column. (b) Find the number of theoretical plates and the plate height for each peak.Please answer Questions 5-3, 5-4, and 5-5 (GC Gas Chromatography) 5-2. A sample mixture of ethyl benzoate (bp 212 Celsius) and dodecane (bp 216.2 Celsius) is injected on two GC columns.Column A has DC710 silicone oil as the stationary phase, and column B uses polyethylene glycol as the stationaryphase. Which substance would be certain to elute first from column A and would the same material be expected toelute first from column B? Which column, A or B, would be expected to give the better separation of these two substances? 5-3. Question 5-2 refers to separating a mixture of two high boiling liquids by gas chromatography. These materials havesimilar boiling points. List several GC variables and conditions that would make it easier to separate thesesubstances by gas chromatography. 5-4. Capillary GC columns have better resolution than packed columns even though the enormous surface area provided by the packing material is absent in capillary columns. Why? 5-5. Preparative GC requires…1a) Hexane, CH3(CH2)4CH3, is found to have a long retention time when separated from a mixture. A column with a C18 (18-carbon chain) stationary phase and a methanol-water modal phase is used for the separation. Explain why hexane has a long retention time. 1b)You wish to chromatographically seperate a mixtureof the follwing compunds. Which of the two compounds will be most difficult to seperatate from one another? Why?
- For indirect iodometric analysis of copper oxide, why did you not need to accurately weight out ki used in the standard and unknown analysis?Identify the effect of the condition on the indicated parameter. Write increase, decrease, or no effect , and provide an explanation The actual concentration of the sodium hydroxide used in the calibration part of the experiment was lower than the stated value. However, the NaOH solution used in the determination of ΔHrxn was of the correct concentration. [magnitude of ΔHrxn]A spectrophotometric method for the quantitative determination of the concentration ofPb2+ in blood yields an Ssamp of 0.133 for a 1 mL sample of blood that has been diluted to 6 mL. A second sample is spiked with 1 µL of a 1467 ppb Pb2+ standard and diluted to 6 mL, yielding an Sspike of 0.491. Determine the concentration of Pb2+ in the original sample of blood.