A 4.2 ppm iron standard solution was found to have a %T of 60%. An unknown...
A 4.2 ppm iron standard solution was found to have a %T of 60%. An unknown solution had a %T of 30%. Calculate the ppm of iron in the unknown and enter number value only.
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A 4.2 ppm iron standard solution was found to have a %T of 60%.
An unknown...
Test Bank, Question 06.114 X Incorrect A 60. mL solution contains 210 ppm of iron. How...
Test Bank, Question 06.114 X Incorrect A 60. mL solution contains 210 ppm of iron. How many milliliters of water must be added to dilute this solution to a final concentration of 30. ppm? 11420 Use correct number of significant digits; the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work
show calculations please 3. A standard solution of Fe(II) [10.0 ppm) was prepared, the appropriate reagents...
show calculations please
3. A standard solution of Fe(II) [10.0 ppm) was prepared, the appropriate reagents were added, and a series of standard solutions were prepared and the transmittance of the solutions were read out as follows: Vol. of std solution (ml) Final vol. (mL) %T 0.00 100.0 100.0 5.00 100.0 77.7 25.00 100.0 30.2 50.00 100.0 10.4 (a) (3 pts) plot a calibration curve and find out the slope and y-intercept for the linearly related Absorbance with concentration. (b)...
A 20-ppm solution of a DNA molecule (unknown molecular weight) isolated from Escherichia coli was found...
A 20-ppm solution of a DNA molecule (unknown molecular weight) isolated from Escherichia coli was found to give an absorbance of 0.80 in a 2-cm cell. Calculate the absorptivity of the molecule. the book says the answer is 20
This calculation has a number of steps. Only the final value is input for assessment. For GC analysis, your sample solution is madeup by mixing 2.00 mL of water with 50.0 µL of your unknown and 3...
This calculation has a number of steps. Only the final value is input for assessment. For GC analysis, your sample solution is madeup by mixing 2.00 mL of water with 50.0 µL of your unknown and 30.0 µL of a 10.0 ppm internal standard. The response factor (F) has previously been determined to be 2.2. The GC analysis yields peak areas of 1675 for the unknown and 1685 for the internal standard. Calculate the concentration of the internal standard in...
An unknown solution containing iron at a concentration between 10 and 50 mg/L is now to...
An unknown solution containing iron at a concentration between 10 and 50 mg/L is now to be analyzed. 25 mL of this unknown solution is diluted to 250 mL with the appropriate reagents to form the ferrous - phenanthroline complex. The diluted solution has an absorption of 0.795. What is the concentration in (mg/L) of ferrous ion in the diluted solution? Enter a numeric answer only, do not include units with your answer. part 2 ) What is the concentration...
Calculate the concentration of each standard in terms of ppm iron. FW= 55.845 g/mol. Please show...
Calculate the concentration of each standard in terms of ppm iron. FW= 55.845 g/mol. Please show your work. First prepare standard solution from a standard Fe stock of 0.13 M. Make 100x dilution (1 mL of stock into 100 mL of water) Then, using a pipet deliver the following volumes of your Fe standard diluted solution into 10 mL volumetric flasks: 0 microliters, 150 micro liters, 300 microliters, 450 microliters, and 600 microliters.
A student prepares a caffeine standard solution that has a concentration of 1858 ppm. To prepare...
A student prepares a caffeine standard solution that has a concentration of 1858 ppm. To prepare a calibration curve, the student pipets various volumes of the standard solution into 50.0 mL volumetric flasks and dilutes to the fill line with water. The absorbance of each solution is measured in a 1.00 cm cuvette using the spectrophotometer and is shown in the table below. Calculate the concentration of each solution and create a calibration curve using the absorbance data provided. Based...
The volumes of a 1.10 ppm standard solution of Zn2+ shown in the table below were pipetted into s...
The volumes of a 1.10 ppm standard solution of Zn2+ shown in the table below were pipetted into separatory funnels each containing 5.00 mL of an unknown zinc solution. Each was extracted with three 5-mL aliquots of CCl4 containing an excess of 8-hydroxyquinoline. The extracts were then diluted to 25.0 mL, and their fluorescence measured with a fluorometer. The results were: Volume Std Zn2+, mL leter Reading 0.000 4.00 8.00 12.00 6.12 11.16 15.68 20.64 Calculate the concentration of zinc...
A solution containing 27.55 mg of an unknown protein per 25.0 mL of solution was found to have...
A solution containing 27.55 mg of an unknown protein per 25.0 mL of solution was found to have an osmotic pressure of 3.22 torr at 25.0oC. What is the molar mass ofthe protein
An aqueous sucrose (C12H22O11) solution of unknown concentration is found to have a freezing point of...
An aqueous sucrose (C12H22O11) solution of unknown concentration is found to have a freezing point of –0.912°C. What is the normal boiling point and the partial pressure (in torr) of water at 25°C of this solution? Kb (H2O) = 0.51°C/m; P°(H2O) = 23.800 torr at 25°C.
Test Bank, Question 06.114 X Incorrect A 60. mL solution contains 210 ppm of iron. How many milliliters of water must be added to dilute this solution to a final concentration of 30. ppm? 11420 Use correct number of significant digits; the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work
show calculations please
3. A standard solution of Fe(II) [10.0 ppm) was prepared, the appropriate reagents were added, and a series of standard solutions were prepared and the transmittance of the solutions were read out as follows: Vol. of std solution (ml) Final vol. (mL) %T 0.00 100.0 100.0 5.00 100.0 77.7 25.00 100.0 30.2 50.00 100.0 10.4 (a) (3 pts) plot a calibration curve and find out the slope and y-intercept for the linearly related Absorbance with concentration. (b)...
The volumes of a 1.10 ppm standard solution of Zn2+ shown in the table below were pipetted into separatory funnels each containing 5.00 mL of an unknown zinc solution. Each was extracted with three 5-mL aliquots of CCl4 containing an excess of 8-hydroxyquinoline. The extracts were then diluted to 25.0 mL, and their fluorescence measured with a fluorometer. The results were: Volume Std Zn2+, mL leter Reading 0.000 4.00 8.00 12.00 6.12 11.16 15.68 20.64 Calculate the concentration of zinc...
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