The fluorescence of a 1x10^-7 M quinine sulfate solution was measured as 31.5 with a fluorometer...
The fluorescence of a 1x10^-7 M quinine sulfate solution was measured as 31.5 with a fluorometer while the background was 4.9. A water sample though to contain quinine measured 52.9. Assuming the concentration is low enough for fluorescence to be linear in concentration, calculate the concentration of quinine in the sample.
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The fluorescence of a 1x10^-7 M quinine sulfate solution was
measured as 31.5 with a fluorometer...
Quinine has been used as an anti-malarial drug for many years. Its aqueous solution in certain...
Quinine has been used as an anti-malarial drug for many years. Its aqueous solution in certain acids has been used as a standard in the determination of fluorescence quantum yield of other fluorophores. The structure of quinine is shown below. Quinine in a 1.664-g antimalarial tablet was dissolved in sufficient 0.10 M HCl to give 500 mL of solution. A 10.00 mL aliquot was then diluted to 100.00 mL with the same acid. The fluorescence intensity for the diluted sample...
7 The fluorescence of each of a series of acidic solutions of quinine was deter mined five times....
7 The fluorescence of each of a series of acidic solutions of quinine was deter mined five times. The results are given below. Concentration, ng m 01020 304050 Fluorescence intensity 422 4460 75 104 32046 63 81109 42145 6079107 5 2244 6378 101 4 2144 6377105 (arbitrary units) Determine the slopes and intercepts of the unweighted and weighted regression lines. Calculate, using both regression lines, the confidence limits for the con centrations of solutions with fluorescence intensities of 15 and...
You have a 5.0 M copper sulfate stock solution and a 2 M NaCl stock solution....
You have a 5.0 M copper sulfate stock solution and a 2 M NaCl stock solution. You wish to prepare a solution with a final concentration of 0.25 M copper sulfate and 0.25 M NaCl containing 330 mL of water as a solvent. How many milliliters of the NaCl stock solution would the solution contain?
is the pH and pOH of the acid solution with [H'] = 0.38 M? What is...
is the pH and pOH of the acid solution with [H'] = 0.38 M? What is the [H30") and TOH concentration of an acid solution with pH = 5.5? 3. How many liters of 0.186 M of NaOH(aq) contain 0.135 mol of NaOH? If 0.123 g NaOH is dissolved in enough water to make 250.0 mL of solution, what is the molarity (M) of the sodium hydroxide solution? If 2.00 mL of 0.456 M NaOH is diluted to exactly 100...
A solution is made by dissolving 26.3 g of chromium(III) sulfate, Cr2(SO4)3, in enough water to...
A solution is made by dissolving 26.3 g of chromium(III) sulfate, Cr2(SO4)3, in enough water to make exactly 500 mL of solution. Calculate the concentration (molarity) of Cr2(SO4)3 in mol/L (M). M Cr2(SO4)3
7. Calculate the molality, m, of a solution prepared from 29.22 grams of potassium sulfate in...
7. Calculate the molality, m, of a solution prepared from 29.22 grams of potassium sulfate in exactly 2000 mL of water. Consider the density of water to be 1.00 g.mL-' 8 How many milligrams of harium bromide would ha avracted within a 1200 gram camole of a
(7. Consider the reaction as follows: Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2 NaCl(aq) A 1.00-mol sample of sodium...
(7. Consider the reaction as follows: Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2 NaCl(aq) A 1.00-mol sample of sodium sulfate was placed into the barium chloride aqueous solution to make solid barium sulfate. (a) How many gram of sodium sulfate was placed into the reaction solution? (b) What is the maximum mass of NaCl formed? (c) If 78.9 g of NaCl was obtained, what was the percent yield of NaCl? 3. How many liters of 0.186 M of NaOH (aq)...
Solutions and Dilutions 1. What would be the percent (%) concentration of a solution that results...
Solutions and Dilutions 1. What would be the percent (%) concentration of a solution that results from the combination of 115.0 grams of potassium nitrate with 0.320 L of water? Identify the solute and solvent of the solution 2. A solution is prepared by mixing together 76.40 mL of liquid ethanol (C2H4O) and 110.25 mL of water. Identify the solute and solvent of the resulting solution. What would be the percent (%) concentration of the solution? 3. How many grams...
7. How many liters of 0.775 M solution can be prepared from 55.0 g of ammonium...
7. How many liters of 0.775 M solution can be prepared from 55.0 g of ammonium iodide? Calculate the volume, in milliliters, of 0.468 M sodium sulfate solution to provide 2.50 g of sodium sulfate. 8. 9. How many milliliters of water should be added to 30.0 mL of a 4.00M solution to obtain a solution with a concentration of 0.200 M. 10. How many grams of AgPO4 can be produced from the reaction of 2.50 L of 0.200M AgNO,...
1. 1x10^-9 moles of strong acid HCl are added to of water (total volume is 1L)....
1. 1x10^-9 moles of strong acid HCl are added to of water (total volume is 1L). the pH of the resulting solution is... a)9 b)8 c)7 d)5 e)2 I got 9 but got the answer incorrect, so i would like to know how to solve this properly and what is the final answer. 2. the pKa of acetic acid is 4.76. if the pH=4.76 and the concentration of sodium acetate is 0.1M, what is the concentration of acetic acid? a)0.05...
7 The fluorescence of each of a series of acidic solutions of quinine was deter mined five times. The results are given below. Concentration, ng m 01020 304050 Fluorescence intensity 422 4460 75 104 32046 63 81109 42145 6079107 5 2244 6378 101 4 2144 6377105 (arbitrary units) Determine the slopes and intercepts of the unweighted and weighted regression lines. Calculate, using both regression lines, the confidence limits for the con centrations of solutions with fluorescence intensities of 15 and...
is the pH and pOH of the acid solution with [H'] = 0.38 M? What is the [H30") and TOH concentration of an acid solution with pH = 5.5? 3. How many liters of 0.186 M of NaOH(aq) contain 0.135 mol of NaOH? If 0.123 g NaOH is dissolved in enough water to make 250.0 mL of solution, what is the molarity (M) of the sodium hydroxide solution? If 2.00 mL of 0.456 M NaOH is diluted to exactly 100...
7. Calculate the molality, m, of a solution prepared from 29.22 grams of potassium sulfate in exactly 2000 mL of water. Consider the density of water to be 1.00 g.mL-' 8 How many milligrams of harium bromide would ha avracted within a 1200 gram camole of a
(7. Consider the reaction as follows: Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2 NaCl(aq) A 1.00-mol sample of sodium sulfate was placed into the barium chloride aqueous solution to make solid barium sulfate. (a) How many gram of sodium sulfate was placed into the reaction solution? (b) What is the maximum mass of NaCl formed? (c) If 78.9 g of NaCl was obtained, what was the percent yield of NaCl? 3. How many liters of 0.186 M of NaOH (aq)...
Solutions and Dilutions 1. What would be the percent (%) concentration of a solution that results from the combination of 115.0 grams of potassium nitrate with 0.320 L of water? Identify the solute and solvent of the solution 2. A solution is prepared by mixing together 76.40 mL of liquid ethanol (C2H4O) and 110.25 mL of water. Identify the solute and solvent of the resulting solution. What would be the percent (%) concentration of the solution? 3. How many grams...
7. How many liters of 0.775 M solution can be prepared from 55.0 g of ammonium iodide? Calculate the volume, in milliliters, of 0.468 M sodium sulfate solution to provide 2.50 g of sodium sulfate. 8. 9. How many milliliters of water should be added to 30.0 mL of a 4.00M solution to obtain a solution with a concentration of 0.200 M. 10. How many grams of AgPO4 can be produced from the reaction of 2.50 L of 0.200M AgNO,...
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