In testing for the presence of lead(II) ions in solution, Jamaal adds a solution of sodium nitrate. What will be the conclusion of the test if no precipitate forms? O Lead(II) ions are not present in solution. O Lead(II) ions are present in the solution. Lead(II) ions are present, but in a very small concentration. More sodium nitrate solution needs to be added before a conclusion can be made. No conclusion can be made in this test.

In testing for the presence of lead(II) ions in solution, Jamaal adds a solution of sodium nitrate. What will be the conclusion of the test if no precipitate forms? O Lead(II) ions are not present in solution. O Lead(II) ions are present in the solution. Lead(II) ions are present, but in a very small concentration. More sodium nitrate solution needs to be added before a conclusion can be made. No conclusion can be made in this test.

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter12: Spectrochemical Methods

Section: Chapter Questions

Problem 11P

See similar textbooks

Similar questions

The chromium in an aqueous sample was determined by pipetting 10.0 ml. of the unknown into each of five 50.0-mL volumetric flasks. Various volumes of a standard containing 12.2 ppm Cr were added to the flasks, following which the solutions were diluted to volume. Unknown,mLStandard, mLAbsorbancc 10.00.00.201 10.010.0 0.292 10.020.0 0.378 10.030.0 0.467 10.040.0 0.554 (a) Plot the data using a spreadsheet. (b) Determine an equation for the relationship between absorbance and volume of standard. (c) Calculate the statistics for the least-squares relationship in (b). (d) I)ctcrmine the conccnt ration oÍCr in ppm in the sample. (e) Find the standard deviation of the result in (d).
3. a. Briefly explain why internal standardization method is useful inanalytical chemistry?b. Why does a response factor of an instrument’s detector need to becalculated?
Please determine Hvap using these: P2- 3.7kpaP1- 19.2kpa T2-276.65KT1-330.15K
For an enzyme reaction followed spectrophotometrically at 340 nm the Vmax was calculated at 0.14 ∆A340/min (ε340 = 5.22 mM-1.cm-1). The 1 mL reaction in a 1 cm cuvette contained 30 ng of an enzyme (Mr of 100 000 g/mole). Calculate the Kcat for this enzyme.
If 5 µM enzyme was used to obtain the data in the summary plot below, V-max = ________________ µM sec-1 and Km = ____________ µM for this enzyme (Enter numeric values to the nearest integer; Do NOT write units.)
A spectrophotometric method for the quantitative analysis of Pb2+ in blood has a normal calibration curve for which Sstd=(0.296 ppb−1)×Cstd+0.003. What is the concentration of Pb2+ in a sample of blood if Ssamp is 0.397?
(Standard addition) Tooth enamel consists mainly of the mineral calcium hydroxyapatite, Ca10(PO4)6(OH)2. Trace elements in teeth of archeological specimen provide anthropologists with clues about diet and diseases of ancient people. Student at Dankook University measured the trace element strontium (Sr) in enamel from extracted wisdom teeth by atomic absorption spectroscopy. Solutions were prepared with a constant total volume of 10 mL containing 0.750 mg dissolved tooth enamel plus variable concentrations of added standard Sr. Added Standard Sr (ng/mL=ppb) 0 2.50 5.00 7.50 10.00 Emission Signal 28.0 34.3 42.8 51.5 58.6 (a) Make a graph showing the experimental data and the calculated straight line. (b) Find the concentration of Sr in the tooth ennamel in parts per million = μg/mL.
pls help very very urgent, explanation is not required
In a cell, 0.50 mL of 0.75 M NaOCl and 2.50 mL of 5.50 x 10-6 M aqueous dye were mixed. The pseudo order was applied and the absorbance was measured as a function of time. By plotting ln [Tint] as a function of time in seconds, a graph with a linear trend is obtained whose slope is -0.0354 s-1. If the order with respect to NaOCl is 1, what is the value of the rate constant in M-1s-1?
Concentration=2.5 X 10^3 μM OD400nm=0.859 1cm cuvette is used what is the extinction coefficient (μM^-1 cm^-1)
Instrumental studies involve the calculation of the instruments' limit of detection (LOD) in addition to the calibration curve. a. What exactly is LOD? b. Why is it necessary to determine it? c. Hpw is it determined?
Please send me the mcqs A,B,C,D,E in 20 minutes it's very urgent plz