A solution of potassium chromate of unknown concentration was analyzed against a standard of various concentrations. What is the linear equation of the standard curve from the given data? Table 1. Data for Standard Calibration Curve Potassium chromate 4 Absorbance at 425 nm Standard (mol/Liter) 0.00040 0.100 0.00080 0.301 0.00120 0.478 0.00160 0.787 0.00200 0.989 O y = 431.59x +0.9899 O y = 0.9919x + 0.731 O y = 566x -0.1482 Oy=566x +0.1482 none of the above

A solution of potassium chromate of unknown concentration was analyzed against a standard of various concentrations. What is the linear equation of the standard curve from the given data? Table 1. Data for Standard Calibration Curve Potassium chromate 4 Absorbance at 425 nm Standard (mol/Liter) 0.00040 0.100 0.00080 0.301 0.00120 0.478 0.00160 0.787 0.00200 0.989 O y = 431.59x +0.9899 O y = 0.9919x + 0.731 O y = 566x -0.1482 Oy=566x +0.1482 none of the above

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter7: Statistical Data Treatment And Evaluation

Section: Chapter Questions

Problem 7.10QAP

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In lecture I mentioned that standard state is usually at 25oC; however, it can be at any specified temperature. In problems 9 and 10 you will calculate ΔGo from Ksp data. The Ksp range over the temperature range in these two problems is consistent with some actual solubility data; however, in order to allow each student to do their own calculation I have made this data for an "unknown" ionic solid. Calculate the value of ΔGo (kJ/mol) at 3.3oC for the dissolution of an ionic solid with a Ksp of 2.5 x 10-11 at 3.3oC. Your answer should have 2 sig figs.
In lecture I mentioned that standard state is usually at 25oC; however, it can be at any specified temperature. In problems 9 and 10 you will calculate ΔGo from Ksp data. The Ksp range over the temperature range in these two problems is consistent with some actually solubility data; however, in order to allow each student to do their own calculation I have made this data for an "unknown" ionic solid. Calculate the value of ΔGo at 5.9oC for the dissolution of an ionic solid with a Ksp of 2.5 x 10-11 at 5.9oC. Your answer should have 2 sig figs.
Note: Express % strength with 4 decimal places. For ratio strength, state the volume only% Astelin nasal spray contains 0.1% azelastine hydrochloride and 125 mcg/mL of benzalkonium chloride as a preservative. A container is capable of delivering 200 metered sprays of 0.137 mL each. The percent concentration of benzalkonium chloride in the preparation is _______%, which is equivalent to a ratio strength of 1 in _____ w/v.
how would u justify this question? my answer is correct i just do not understand the justification. this is a non graded practice worksheet
Which is true with distribution coefficient? A partitioning of a compound exist between a mixture of two immiscible phases at equilibrium It explains the process when species move from one phase to another phase in immicibel system It is used to predict the amount of solute that can be extracted from a solution during extraction All are correct Only I and II are correct Only III is correct none of the atatement is correct
9. Calculate the Go in kJ/mol. 3Fe2+ (s) + 2Cr(aq) ⟶2Cr3+(aq) + 3Fe (s); Eocell=0.30 V Group of answer choices -170 +170 +87 +58 -195 10. Calculate Ecell in volts. Zn(s)|Zn2+(2.50x10-4M)||Sn2+(1.50M)|Sn(s) Eocell=+0.624 V Group of answer choices 0.736 0.635 0.512 0.848 no correct answer
The student then determined ΔH neutralization for the reaction of sodium hydroxide and acetic acid, using the procedure described in this module. The student added 100.0 mL of 0.8500M NaOH to 100.0 mL of 0.8404M acetic acid. Prior to and following the mixing of the acid and base solutions, the following temperature-time data were collected. g) Identify the limiting reagent and briefly explain why it is limiting. h) Find ΔH neutralization for the reaction.
Consider the problem below: (Equation 1) 4 CO(g) + 4 H2O(l) ---> C4H8(l) + 4 O2(g) ΔH = 890.6 kJ/mol (Equation 2) CO2(g) ---> CO(g) + 1/2 O2(g) ΔH = 90.6 kJ/mol (Equation 3) C4H8(l) + 6 O2(g) ---> 4 CO2(g) + 4 H2O(l) ΔH = ??????? The ΔH for equation 3 is:______(express in kJ) Screen Reader Version Consider the problem below: (Equation 1) 4 CO(g) + 4 H2O(l) arrow C4H8(l) + 4 O2(g) ΔH = 890.6 kJ/mol (Equation 2) CO2(g) arrow C O(g) + 1/2 O2(g) ΔH = 90.6 kJ/mol (Equation 3) C4H8(l) + 6 O2(g) arrow 4 CO2(g) + 4 H2O(l) ΔH = ??????? The ΔH for equation 3 is:______(express in kJ)
100.0 cm3 of a 1.234 mol.dm-3 solution of nickel(II) nitrate was added to 150.0 cm3 of a 1.178 mol.dm-3 solution of sodium carbonate. Determine the limiting reagent
A chart is prepared by plotting In Ksp versus 1/T, using data obtained by performing a lab experiment. Refer to the attached photo for guidance on how to perform these calculations; Equation 5 is particularly useful. A linear fit of the data in the chart yields the equation y = (-4.976x10^3)x+(1.9900x10^1) with an R2 value of 0.9922. Determine the entropy (deltaS in J/K) associated with dissolving KNO3. Answer in scientific notation with appropriate sigfigs.
State the assumptions for the following expressions to apply: dH = dq Group of answer options Constant pressure The expression never applies Isolated system The expression always applies
00 mL of a diprotic acid primary standard solution was accurately prepared to a concentration of 0.1431 M. Three samples of this primary standard solution were used as samples in a titration to standardize an aqueous solution of sodium hydroxide, NaOH, which would be used as a titrant. Using the following table of data for the titration of the primary standard acid with NaOH, calculate the average concentration of NaOH. Trial # Volume of primary standard Initial titrant volume Final titrant volume 1 10.00 mL 8.21 mL 27.22 mL 2 10.00 mL 27.22 mL 46.23 mL 3 10.00 mL 30.28 mL 49.29 mL 0.1506 M 0.0753 M 0.0376 M 0.1431 M 0.0526 M