Sample Analysis Source of Water sample:Tap Water Molarity of Na2S2O3 1 2 3 0.0243 0.0245 0.0228 Average Molarity of Na2S2O3 0.0239 Trials 1 2 3 Volume of sample used 100.00 100.00 100.00 Final Volume Reading Na2S2O3 (ml) 6.70 10.00 13.10 Initial Volume Reading Na2S2O3 (ml) 3.40 6.70 10.00 Net VolumeNa2S2O3 used (ml) 3.30 3.30 3.10 mg O2 in sample ppm O2 in sample average ppm O2 in sample

Sample Analysis Source of Water sample:Tap Water Molarity of Na2S2O3 1 2 3 0.0243 0.0245 0.0228 Average Molarity of Na2S2O3 0.0239 Trials 1 2 3 Volume of sample used 100.00 100.00 100.00 Final Volume Reading Na2S2O3 (ml) 6.70 10.00 13.10 Initial Volume Reading Na2S2O3 (ml) 3.40 6.70 10.00 Net VolumeNa2S2O3 used (ml) 3.30 3.30 3.10 mg O2 in sample ppm O2 in sample average ppm O2 in sample

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter31: Introduction To Analytical Separations

Section: Chapter Questions

Problem 31.12QAP

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Standardization of Sodium Thiosulfate Solution Primary Standard used: Potassium Dichromate Formula mass of 1o standard: __________________ % Purity of 1o standard: 99.80% Trials 1 2 3 Weight of K2Cr2O7 (g)Weight of K2Cr2O7 (g) 0.0315 0.0331 0.0380 Final Volume Reading Na2S2O3 (ml) 27.50 27.50 34.90 Initial Volume Reading Na2S2O3 (ml) 1.10 0.00 1.00 Net Volume Na2S2O3 used (ml) Molarity of Na2S2O3
The gravimetric factor used to express CoCBr6·H20 in a sample that is finally weighed as PbClBr is choose below: FW PbClBr / 6 x FW CoCBr6·H20 FW CoCBr6·H20 / FW PbClBr FW CoCBr6·H20 / 6 x FW PbClBr 6 x FW PbClBr / FW CoCBr6·H20
Study the tabulated data during an gravimetric analysis of BaSO4 experiment Trial T1 T2 T3 Mass of sample (g) 1.0040 1.0100 1.0050 Constant weight of empty crucible (g) 10.2453 10.2454 10.2454 Constant weight after ignition (g) 10.3253 10.3252 10.3253 1. Calculate the mean mass of precipitate as BaSO4 a. 0.0799 g b. 0.0800 c. 0.08 g 2. Calculate the mean weight of sulphate (MM BaSO4 = 233.39 g/mol, So42- = 176 g/mol)? a. 0.0603 g b. 0.06 g c. 0.06025 g 3. Calculate the mean % SO42- in the sample a. 6.00% b. 5.991% c. 5.9908%
Determine the concentration of linalool in a highly valued lavender essential oil. The peak areas of a series of standard solutions (calibrations standards) acquired from GC-MS (gas chromatography-mass spectrometry) is presented below. Concentration (mg/L) Peak area 0 201 25 5214 50 14658 75 23647 100 32657 125 42652 150 52478 QUESTION: Calculate the concentration of linalool in yourhighly valued lavender essential oil which returns a peak area of 27235.
Trial one Trial two KIO3 solution taken (mL) 1.70 16.5 Moles of KIO3 1.06 x 10^-3 1.06 x 10^-3 Final buret reading (mL) 17.0 33.5 Initial buret reading 0 17.0 Volume of Na2S2O3 solution (mL) 17.0 16.5 Molarity of Na2S2O3 solution (MOL/L) 0.374 0.389 MEAN molarity (mol/L) 0.382 Filtrate Trail one Trail two Final buret reading (mL) 24.0 47.9 Initial buret reading (mL) 0 24.0 Volume of Na2S2O3 solution (mL) 24.0 23.9 Moles of Na2S2O3 used 0.00917 0.00913 Moles if IO3^- present initially 7.05 x 10^-4 7.02 x 10^-4 Molarity of IO3^- (mol/L) 3.53 x 10^-2 3.51 x 10^-2 Average 1.7 x 10^-4 1a. Calculate the solubility of Ca(IO3)2 from your results with the first and second filtrates 1c. Calculate Ksp for Ca(IO3)2 using the mean solubilitity
A 18 g of unknown organic sample was dissolve in 756 mL of benzene. The boiling point of benzene was increased by 3.36oC. As the first step of analysis, determine the moecular weight of the unknow sample? Kb of benzene= 2.64oC/m Bb of benzene = 80.09 oC density of benzene = 0.874 g/mL at 25 °C Answer in whole number, no units required.
EX 2.Given-> Volume of Na+ = 500 ml Molarity of Na+= 0.0100M Molar mass of Na2CO3 = 105.99 gm/mole Millimole of Na+ = molarity × volume Number of millimole = 0.0100 × 500 = 5 millimole Na2CO3 ---> 2Na+ + CO32- Millimole of Na2CO3 = millimole of Na+/2 Millimole of Na2CO3 =5/2 = 2.5 millimole Mole of Na2CO3 = 2.5 × 10-3mole (1 mole = 10^3 millimole) Weight of Na2CO3 required = mole × molar mass = 2.5 × 10-3 × 105.99 =0.26 gm Hence, 0.26 gm Na2CO3 must dissolve in 500 ml of water.
Density of solution:Trial 1: 1.2 g/mLTrial 2: 1.2 g/mLTrial 3: 1.2 g/mL Average density = 1.2 g/mL What is the relative average deviaion, %?
Table of caffeine standards concentration . Sample Conc, ppm Std1 16 Std2 32 Std3 48 Std4 64 Std5 80 If the volume used to make 100 mL of std 1 is 2 uL what is the concentration in M used to make std calibration curve ? The standards are going to be used to build calibration curve to analyze caffeine in an energy drink. if 500 mL of the energy drink has target of 400 mg , how will you prepare the sample if you need 10 mL for the analysis ? Caffeine MM=194.19 g/mol.
19 g of unknown organic sample was dissolve in 640 mL of Dicloromethane (DCM). The boiling point of benzene was increased by 3.78oC. Determine the molecular weight of the unknown sample? Kb of DCM = 2.42oC/m Bb of benzene = 39.6 oC density of benzene = 1.33 g/mL at 25 °C Round your answer to the nearest whole number, no units required.
Calculate the Standardized Molarity of NaOH via dimensional analysis. Show your process.Use this table in answering the Standardized Molarity of NaOH in Trials 1, 2, and 3. TRIALS 1 2 3 Actual weight of Std. KHP (g) 0.8026 0.8032 0.8021 Corrected weight of KHP (g) based on % purity of primary std. 0.7986g 0.7992g 0.7981g Volume NaOH used (ml) 39.45 39.35 39.47
The thiourea in a 1.455 g sample of organic material was extracted into a dilute sulfuric acid solution and titrated with 37.31 mL of 0.009372 M Hg2+ via reaction: 4(NH2)2CS + Hg2+ →[(NH2)2CS]4 Hg2+ P.S. Answer only the last two letters of the following questions. (Only C and D) a. Is this an example of total analysis technique or concentration technique? Explain. b. Calculate the percent (NH2)2CS ( 76.12 g/mol) in the sample. c. What is classification of the analysis based on the amount of sample and amount of analytes present? Explain. d. If the true value is 10.00%, calculate the absolute and relative error.

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Molarity of Na₂S₂O₃	1	2	3
	0.0243	0.0245	0.0228
Average Molarity of Na₂S₂O₃	0.0239

Trials	1	2	3
Volume of sample used	100.00	100.00	100.00
Final Volume Reading Na₂S₂O₃ (ml)	6.70	10.00	13.10
Initial Volume Reading Na₂S₂O₃ (ml)	3.40	6.70	10.00
Net VolumeNa₂S₂O₃ used (ml)	3.30	3.30	3.10
mg O₂ in sample
ppm O₂ in sample
average ppm O₂ in sample