INSTRUMENTAL ANALYSIS-ACCESS >CUSTOM<
7th Edition
ISBN: 9781337783439
Author: Skoog
Publisher: CENGAGE C
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Chapter 26, Problem 26.22QAP
Interpretation Introduction
Interpretation:
The percentage of each component in the given mixture is to be stated.
Concept introduction:
The retention factor is the ratio of the number of moles of the solutes in the mobile phase and the number of moles of the solutes in the stationary phase.
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Chapter 26 Solutions
INSTRUMENTAL ANALYSIS-ACCESS >CUSTOM<
Ch. 26 - Prob. 26.1QAPCh. 26 - Prob. 26.2QAPCh. 26 - Prob. 26.3QAPCh. 26 - Prob. 26.4QAPCh. 26 - Prob. 26.5QAPCh. 26 - Prob. 26.6QAPCh. 26 - Prob. 26.7QAPCh. 26 - Prob. 26.8QAPCh. 26 - Prob. 26.9QAPCh. 26 - Prob. 26.10QAP
Ch. 26 - Prob. 26.11QAPCh. 26 - Prob. 26.12QAPCh. 26 - Prob. 26.13QAPCh. 26 - Prob. 26.14QAPCh. 26 - Prob. 26.15QAPCh. 26 - Prob. 26.16QAPCh. 26 - From the data in Problem 26-14, calculate for...Ch. 26 - Prob. 26.18QAPCh. 26 - Prob. 26.19QAPCh. 26 - Prob. 26.20QAPCh. 26 - Prob. 26.21QAPCh. 26 - Prob. 26.22QAPCh. 26 - Prob. 26.23QAP
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- For quantitative analysis with gas chromatography: O the area of a peak reported by the instrument for a compound is proportional to the quantity of that compound. O the calculated response factor value for a compound is proportional to the quantity of that compound. O the retention time reported by the instrument for a compound is proportional to the quantity of that compound. O the peak height reported by the instrument for a compound is inversely proportional to the quantity of that compound. O the peak shape reported by the instrument for a compound is proportional to the quantity of that compound.arrow_forward1) Study the chromatograph (below) of a mixture of Compounds A and B, run on the GCs in the teaching labs at CU Boulder. Compound A has the shorter retention time. STAAT 61 1.11 227 RT TYPE AREA XXXX XXXX XXXX AREAS 0.009 55874 44.117 ARIHT 0.61 XX XX XX 1.11 2.27 XX XX XX TOTAL AREA=XX MUL FACTOR=XX 1. What is the retention time of compound A? Compound B? 2. Which compound is present in a larger amount? 3. Which compound has the lower boiling point? 4. What would happen to the retention times of compounds A and B if the column temperature were raised? 5. You suspect that compound B is octane. What can you do to provide supporting evidence for this hypothesis?arrow_forwardA student places an unknown sample on a thin-layer chromatography plate and develops it in dichloromethane as a solvent. Only one spot whose Rf is 0.98 is observed. Does this result indicate that the unknown material is a pure compound? If not a pure compound, suggest an alternate procedure to verify the purity of the sample.arrow_forward
- A chromatographic column is eluted with a solution containing a mixture of two components, X and Y. The chemical affinity of X for the stationary phase is less than that of Y and the chemical affinity for X for the mobile is greater than that of Y. Which substance will be eluted first? Explain your answer.arrow_forwardWhich statement(s) are correct for gas chromatography? A) the components in a mixture can be identified from their retention time. B) the relative peak areas give the proportions of components in a mixture. C) Calibration curves are used to confirms the concentrations of components in a mixture.arrow_forwardThe height of three peaks; A, B, and C obtained in a gas chromatogram are 20.6 mm, 17.5 mm and 40.6 mm. The width of the peaks, at half height, are 4.4 mm, 4.0 mm and 3.9 mm, respectively. Calculate the percentage composition of A in the sample.arrow_forward
- Which of the following changes would work to improve chromatographic separations? Explain briefly why each option would or would not help. 1) Decreasing the length of the column. 2) Increasing the diameter of the column 3) Decreasing the diameter of the column 4) Increasing the length of the columnarrow_forwardHow do I answer this question?arrow_forwardA 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.arrow_forward
- 3. A student administered ibuprofen to a lab mice orally. She would like to find out the amount of ibuprofen in blood plasma at a specific time using HPLC. The chromatographic peak areas after 2 hours, 4 hours, and 8 hours are 38.34, 20.5, and 14.95 respectively. What is the concentration of ibuprofen in the plasma at each aforementioned time? Below is the corresponding peak area of the 5 ibuprofen standards. Standard Concentration (mg/mL) Peak area 5.02 0.5 1.0 10.05 2.0 17.15 3.0 19.79 6.0 39.72arrow_forwardExplain how TLC and column chromatography can be used together to ensure the perfect separation of two organic compoundsarrow_forward3. Two peaks in a particular gas chromatogram have a retention ratio of 1.25. If this mixture was injected into a gas chromatograph column which had the same column type but a longer column, how would you expect the retention ratio to change?arrow_forward
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