Questions and Answers of Fundamentals Of Analytical Chemistry

A standard method for the determination of glucose in serum is reported to have a standard deviation of 0.36 mg/dL. If s = 0.36 is a good estimate of σ, how many replicate determinations should be
A chemist obtained the following data for percent lindane in the triplicate analysis of an insecticide preparation: 7.23, 6.95, and 7.53. Calculate the 90% confidence interval for the mean of the
An atomic absorption method for determination of copper in fuel samples yielded a pooled standard deviation of spooled = 0.19 mg Cu/mL (s→σ). The analysis of an oil from a reciprocating aircraft
The inside diameter of an open cylindrical tank was measured. The results of four replicate measurements were 5.2, 5.7, 5.3, and 5.5 m. Measurements of the height of the tank yielded 7.9, 7.8, and
From the normal curve of error, find the probability that a result is outside the limits of ±2σ from the mean. What is the probability that a result has a more negative deviation from the mean than
Distinguish between(a) The sample variance and the population variance.(b) The meaning of the word sample as it is used in a chemical and in a statistical sense.
Define(a) Sample standard deviation.(b) Coefficient of variation.(c) Variance.(d) Standard error of the mean
A loss of 0.4 mg of Zn occurs in the course of an analysis for that element. Calculate the percent relative error due to this loss if the mass of Zn in the sample is(a) 30 mg. (b) 100 mg.(c) 300
The color change of a chemical indicator requires an overtitration of 0.03 mL. Calculate the percent relative error if the total volume of titrant is(a) 50.00 mL. (b) 10.0 mL.(c) 25.0
Describe how systematic method errors may be detected.
Name three types of systematic errors.
Exactly 750.0 mL of a solution that contains 500.0 ppm of Ba(NO3)2 is mixed with 200.0 mL of a solution that was 0.04100 M in Al2(SO4)3.(a) What mass of solid BaSO4 is formed?(b) What is the molar
What volume of 0.01000 M AgNO3 is required to precipitate all of the I- in 150 mL of a solution that contains 22.50 ppt KI?
What mass of MgNH4PO4 precipitates when 200.0 mL of a 1.000% (w/v) solution of MgCl2 is treated with 40.0 mL of 0.1753 M Na3PO4 and an excess of NH4+ ? What is the molar concentration of the excess
Exactly 75.00 mL of a 0.3132 M solution of Na2SO3 is treated with 150.0 mL of 0.4025 M HClO4 and boiled to remove the SO2 formed.(a) What is the mass in grams of SO2 that is evolved?(b) What is the
Exactly 25.0 mL of a 0.3757 M solution of Na3PO4 is mixed with 100.00 mL of 0.5151 M HgNO3.(a) What mass of solid Hg3PO4 is formed?(b) What is the molar concentration of the unreacted species (Na3PO4
What mass of solid PbCl2 (278.10 g/mol) is formed when 200 mL of 0.125 M Pb2+ is mixed with 400 mL of 0.175 M Cl-?
Describe the preparation of(a) 2.50 L of 0.0250 M KMnO4 from the solid reagent.(b) 4.00 L of 0.250 M HClO4, starting with an 8.00 M solution of the reagent.(c) 500 mL of a solution that is 0.0200 M
Describe the preparation of(a) 1.50 L of 21.0% (w/v) aqueous glycerol (C3H8O3, 92.1 g/mol).(b) 1.50 kg of 21.0% (w/w) aqueous glycerol.(c) 1.50 L of 21.0% (v/v) aqueous glycerol.
A 5.85% (w/w) Fe(NO3)3 (241.86 g/mol) solution has a density of 1.059 g/mL. Calculate(a) The molar analytical concentration of Fe(NO3)3 in this solution.(b) The molar NO3 - concentration in the
A solution was prepared by dissolving 875 mg of K3Fe(CN)6 (329.2 g/mol) in sufficient water to give 750 mL. Calculate (a) The molar analytical concentration of K3Fe(CN)6.(b) The molar
Average human blood contains 300 nmoles of hemoglobin(Hb) per liter of plasma and 2.2 mmol per liter of whole blood. Calculate(a) The molar concentration in each of these media.(b) PHb in plasma in
Calculate the molar H3O+ ion concentration of a solution that has a pH of(a) 3.73.(b) 3.28.(c) 0.59.(d) 11.29.(e) 7.62.(f) 5.19.(g) -0.76.(h) -0.42.
Calculate the p-value for each of the listed ions in the following:(a) Na+, Cl-, and OH- in a solution that is 0.0635 M in NaCl and 0.0403 M in NaOH.(b) Ba2+, Mn2+, and Cl- in a solution that is 4.65
What is the mass in grams of(a) 2.25 mol of KBr?(b) 15.5 mmol of PbO?(c) 5.04 mol of CaSO4?(d) 10.9 mmol of Fe(NH4)2(SO4)2 . 6H2O?
Find the number of millimoles of solute in(a) 386 mL of 0.210 M HClO4.(b) 25.0 L of 8.05 x 10-3 M K2CrO4.(c) 4.50 L of an aqueous solution that contains 6.95 ppm of AgNO3.(d) 537 mL of 0.0200 M KOH.
Find the amount in millimoles of the indicated species in(a) 12.92 g of NaHCO3.(b) 57 mg of MgNH4PO4.(c) 850 mg of P2O5.(d) 40.0 g of CO2.
Find the number of K+ ions in 1.43 mol of K2HPO4?
How did the definition of the mole change with the 2019 redefinition of SI base units?
Why is 1 g no longer exactly 1 mole of unified atomic mass units?
What is the difference between molar species concentration and molar analytical concentration?
Define(a) Molar mass.(b) Millimole.(c) Millimolar mass.(d) Parts per billion.
Consider the following sets of replicate measurements:For each set, calculate the(a) Mean, (b) Median, (c) Spread or range, (d) Standard deviation, (e) Coefficient of variation.

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