Which data point in your standard curve is the most important in determining the best straight line1.through your data? Why? Which is the second most important? Why?pathlength cell displays % T of 50.0 what is the Absorbance of the solution and what is theabsorptivity (in /cm-mole). What Absorbance would be expected for a 5.0 x 10-6 M solution?What % T would this correspond to?2.A solution of a light absorbing species with a concentration of 1.0 x 10-5M in a 1.0 cm C.НAbsorbance Vs. Concentration V= 2528.2x+0.0253R = 0.968331.940714242.0.0002 0.4956553770.0001535.270786170.452584860.60.0001 0.26238305754.653369520.566.098422190.00005 0.1798089076 concentration absorbance %transmittance0.48 Slope0.39 Eb2528.1734120.210 r20.9682980190.11112 unknownabsorbance0.040399130,000150,00010.000250,000050.000214Concentration (M)15AbsorbanceE.

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Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter8: Sampling, Standardization, And Calibration

Section: Chapter Questions

Problem 8.18QAP

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In this station, you will find a sample of table salt; the chemical formula of table salt is NaCl. Using the balance, weigh out 6.00 g of NaCl and dissolve in 50 mL of deionized (d.i.) water. Once com-pletely dissolved, add additional d.i. water to make the final volume of solution 100.0 mL. What is the mass percent NaCl in the solution? What is the molarity of the solution
Sample 1 2 3 4 Sample Volume, mL 50.00 49.50 25.00 50.00 Ba(OH)2 Volume, mL 43.17 42.68 21.47 43.33 A 0.1475-M solution of Ba(OH)2 was used to titrate the acetic acid (60.05 g/mol) in a dilute aqueous solution. The above results were obtained. 1. Calculate the mean w/v percentage of acetic acid in the sample 2. Calculate the standard deviation for the results. 3. Calculate the 90% confidence interval for the mean. 4. At the 90% confidence level, could any of the results be discarded?
An unknown food-dye is analyzed by the method used in this experiment. The absorbance of 5 standard solutions is plotted vs. their concentration (molarity) and a straight line is obtained with the formula: Abs = 4.150x +0.08 An unknown food-dye soluton is diluted and it's absorbance is found to be 0.65. What is the molarity of the diluted unknown, to two significant figures? Do not type units with your answer. Your Answer:
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5. A conductivity cell filled with 0.10 demal KCI solution gives at 25°C a resistance of 910 ohms. What will be the resistance when this cell is filled with a solution whose specific conductance at 25°C is 0.00532 mho? ERS
e teaching and le x .. Calendar m/ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-... <ΔΗ° this question. Given the standard enthalpy changes for the following two reactions: X (1) 2Zn(s) + O2(g) → 2ZnO(s) (2) Zn(s) + Cl₂ (g) → ZnCl₂ (s) KJ + Submit Answer 8 more group attempts remaining what is the standard enthalpy change for the reaction: (3) 2ZnCl₂ (s) + O₂(g) → 2ZnO(s) + 2Cl₂ (g) ΔΗ° =? Retry Entire Group ΔΗ° - 696.6 kJ AH = -415.0 kJ == Previous Next
A 500.00 mg vitamin C (MW176.12g/mol) tablet was ground, acidified, and dissolved in H20 to make a 250.0 mL solution. A 50.00 mL aliquot containing vitamin C, KI and starch was analyzed and titrated with 12.31 mL of 0.01042 M KIO3. What is the % (w/w) vitamin C in the tablet? KIO3 + 5 KI + 6 H* = 3 12 + 6 K* + 3 H20 C6H8O6 + 12 = C6H6O6 + 21 + 2H* %3D 3.39 % 33.89 % 67.77 % 22.59 %
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C. Electrolytes in Body Fluids 1. Type of IV Solution 5% Isolute P (mEa/L) Plasnalyte (mEg/L) Lactated Ringer's (mEg/L) Nal+ = 130 Klt = 4 Ca2+ = 3 Nal+ = 25 K+ = 20 Nal+ = 140 Kl+ = 5 2. Cations %3D %3D Mg+ = 3 Mg2+ = 3 CI- = 22 HPO- =3 Acl- = 23 CI- = 98 Glu'-= 23 Acl- = 27 3. Anions CI'- = 109 %3D HPO = 28 %3D %3D 4. Total Charge of Cations (+) 137 137 5. Total Charge of Anions (-) 6. Sum of the Charges Copyright 2014 Pearson Education, Inc.
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-1! The concentrations of three dilute solutions of sodium acetate were measured in a con- ductance cell in which the parallel electrodes were 1 cm in area and 0.25 cm apart. Resistances of 274,700, 91,000 and 18,320 ohms were determined for the three solu- tions. Calculate the normality of each solution. T = 25°C.
3. If AH*= 10 kcal/mol and AS = +10 eu, at what temperature will AG = 0? Show your work. %3D

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