A toluene solution (1.50 mg / L) shows an absorbance of 0.30 in a cuvette with a 0.025 mm optical path. Calculate the limit of detection (in ppb) for toluene if the noise with the solvent spectrum is 0.002 absorbance units in a 0.050 mm cuvette.
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- A toluene solution (1.50 mg / L) shows an absorbance of 0.30 in a cuvette with a 0.025 mm optical path. Calculate the limit of detection (in ppb) for toluene if the noise with the solvent spectrum is 0.002 absorbance units in a 0.050 mm cuvette.A (0.002M) Cu2+ solution gave an absorbance of 0.50 at 560 nm in a 1.0 cm cell. The molar absobitivity of solution is equel:The absorbance of an iron() thiocyanate, Fe(SCN) 3 (MM=230.09 g/mol) , solution containing 0.00955mg / m * L is reported as 0.376 at 540 nm. Calculate the specific absortivity of iron() thyocyanate with units c * m ^ - 1 * (mg / m * L) ^ - 1 A 0.58 cm sample cuvette is used. Report your answer to 3 significant figures.
- 2. Answer ALL parts. (a) The absorbance of compound A was measured in a 1.00 cm cuvette at 238 nm. A 3.96 x 10 M solution of compound A exhibited an absorbance of 0.624. A blank solution containing only the solvent had an absorbance of 0.029 at the same wavelength. Calculate the molar absorptivity of compoundA in m' mole". (i) The absorbance of an unknown solution of Compound A in the same solvent and cuvette was 0.375 at 238 nm. Find the concentration of A in the unknown. (iii) A concentrated solution of Compound A in the same solvent was diluted from an initial volume of 2.00ml to a final volume of 25 ml and then had an absorbance of 0.733 under the same conditions. What is the concentration of A in the concentrated solution? (iv) What type of cuvette was used in the above analysis? Justify your answer. (b) Name ONE advantage and ONE disadvantage of a linear photodiode array detector compared to a traditional photomultiplier based spectrometer. (c) Why is an FTIR spectrum digital in…Tablet powder containing 100mg of promazine hydrochloride is ground to a paste with 10 ml of 2 M HCl. The paste is then diluted with 300 ml of water, shaken for 15 min and finally made up to 500 ml. A portion of the extract is filtered. Then, 5 ml of the filtrate is taken and diluted to 200 ml with 0.1 M HCl. – Absorbance reading=0.855 is read at a wavelength wavelength of 251 nm – a (1%, 1 cm) value of promazine.HCl at 251 nm=950 – Stated content of promazine.HCl per tablet=60 mg – Weight of 24 tablets=1.500g – Weight of tablet powder taken for assay=180 mg expected content in tablet taken is: 172.8 mg 1000mg 100 mg 100g Concentration in diluted tablet extract is: 0.1g/mL 0.9 g/100ml 1.11 g/mL 0.9 mg/100ml Concentration in original tablet extract is: 36g/mL 36 mg/100ml 19.38 mg/100ml 16.15 mg/mL Amount of promazine.HCl in original extract is: 172.8mg 180mg/100ml 96.90mg 180mg percentage of stated content 99.1 % 96% 80.75mg/100ml 104.2%Solutions of fluorene (diphenylmethane) in benzene can be analyzed by making use of its absorbanceat 301 nm wavelength. If a solution of fluorene of unknown concentration in benzene exhibits anabsorbance of 0.720 in a 1.00-cm cuvette cell. What is the concentration of fluorene? (Ans. c = 6.55x10 -5 M)
- The absorbance of an iron(III) thiocyanate, Fe(SCN)3 (MM = 230.09 g/mol), solution containing 0.00181 mg/mL is reported as 0.833 at 540 nm. Calculate the specific absortivity of iron(III) thyocyanate with units cm-1 (mg/mL)-1 . A 0.77 cm sample cuvette is used. Report your answer to 3 significant figures.A solution is prepared by diluting 2.79 mL of the blue dye stock solution to 25.00 mL. The measured absorbance for the prepared solution is: Blue dye stock solution = 0.293 M Absorbance at 630 nm = 0.00265 Calibration curve y = 0.0833x A.) What is the theoretical molar concentration? B.) What is the experimental molar concentration? C.) What is the percent error?g 2.png Average absorbance, .129 +0.128 +0.127)/3 = 0.128 Chrome Concentration of Females of Fe volume Q Molarity of Fe(NO₂)) = 0.2M Volume of Fe(NO₂)); = 5.00mL Moles of Fe³+= Molarity x Molarity x volume(L) Moles of Fe³* = 0.2M x 0.0054 = 10³mole 10-mole 500 x 10-3=0.002M [Fe³+] = [SCN¯] = X = ✪ [Fe³] = 0.002mol/L nknown concentrations to determine [FeSCN]at equilibrium in solution 8: Y = 4290X - 0.068 72% (0.127 + 0.068) 4290 0.127=4290X - 0.068 25ml Fe³+ x 0.002 mol/L-¹ 100mL 100% = 4.5 x 10-5mol/L 20ml SCN X 0.002 mol/L-¹ 100mL = 5.00 x 10^4 mol/L^-1 = 4.00 x 10 mol/L-1 W Flask 8 Flask 9 Flask 10 Flask 11 3.png 4.png Part 3: Q8 Flask 8 Flask 9 Flask 10 Flask 11 Part 3: 09 Flask 8 Flask 9 Flask 10 Flask 11 [Fe³+ (mol/L) 5.00 x 10-4 5.00 x 10-4 5.00 x 10-4 5.00 x 10-4 Average absorbance 0.127 0.166 0.222 69% 0.308 100% [FESCN¹ (mol/L) 4.5 x 10- 5.4 x 10 6.76 x 10-5 8.76 x 10- [SCN (mol/L) 4.00 x 10-4 4 x 10-4 7 x 10-4 1x 10-³ 3 7.png Place the results from calculations 9 and 10 into…
- The absorbance of an iron (III) thiocyanate, Fe(SCN)3 (MM= 230.09 g/mol), solution containing 0.00500 mg/mL is reported as 0.4900 at 540 nm. Calculate the specific absorptivity, including units, of iron (III) thyocyanate on the assumption that a 1.00 cm cuvette is used.The measures absorbance of a solution with a pathlength of 1.00 cm is 0.544. If the concentration is 1.40 x 10^-3 M, what is the molar absorptivity for this analyte?Tablet powder containing 80 mg of promazine hydrochloride is ground to a paste with 10 ml of 2 M HCl. The paste is then diluted with 200 ml of water, shaken for 15 min and finally made up to 500 ml. A portion of the extract is filtered. Then, 5 ml of the filtrate is taken and diluted to 120 ml with 0.1 M HCl. – Absorbance reading=0.755 is read at a wavelength wavelength of 251 nm – A (1%, 1 cm) value of promazine.HCl at 251 nm=935 – Stated content of promazine.HCl per tablet=50 mg – Weight of 20 tablets=1.667 g – Weight of tablet powder taken for assay=163 mg expected content in tablet taken is: A-97.78 g/mL B-97.78 g/100ml C-0.0097g/mL D-97.78 mg/100ml Concentration in diluted tablet extract is: A-0.81g/mL B-80 g/100ml C-0.00081g/mL D-0.807 mg/100ml Concentration in original tablet extract is: A-19.38g/mL B-16.15 mg/100ml C-19.38 mg/100ml D-16.15 mg/mL Amount of promazine.HCl in original extract is: A-96.90mg B-80.75mg C-96.90mg/100ml D-80.75mg/100ml…