Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 21, Problem 21.13QAP
Interpretation Introduction
Interpretation:
The current on moving the tip in 0.10 nm steps from 0.40 nm to 1.50 nm should be calculated.
Concept introduction:
The magnitude of the tunneling current It is given by,
V − bias voltage
C −constant
d − distance between the probe and the surface
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
An atomic beam is designed to function with (a) cadmium, (b) mercury. The source is an oven maintained at 380K with a small slit of dimensions 1.0cm x 1.0 x 10-3cm. The vapor pressure of cadmium is 0.13 Pa nd that of mercury is 12 Pa at this temperature. What is the atomic current (the number of atoms per second) in the beams?
The classical dissociation constant of propionic acid, C2H5CO2H, is 1.34 x10-5 moldm-3 at 250C and the limiting molar conductivities at zero concentration of hydrogen and propionate ions are 349.8 and 35.8 ohm-1 cm2 mol-1 respectively. Calculation of the resistivity of 0.100 M solution of propionic acid.
Explain why small uncertainties in the measured potential of ISEs can cause large errors in the determined analyte concentration.
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- Calculate the current density if the drift velocity equals 8 x 10 m/s, conductivity of 72 megaS per meter, charge mobility of 0.0076 m^2/V-s.arrow_forwardWhat are the advantages of a dropping-mercury electrode in polarography? Why is polarography used mainly to study reductions rather than oxidations?arrow_forward(a) A silicon sample maintained at T = 300 K is uniformly doped with Nd = 1016cm-3 donors. Calculate the resistivity of the sample.arrow_forward
- The molar absorptivity for aqueous solutions of phenol at 211 nm is 6.17 × 103 L cm-1 mol-1. Calculate the permissible range of phenol concentrations if the transmittance is to be less than 85% and greater than 7% when the measurements are made in 1.00-cm cells.arrow_forwardWhat are the different tetrabasic forms of EDTA?arrow_forwardThe table shows a series of standard additions of Cu(II)to acidified tap water samples measured by anodic stripping voltammetry at a platinum electrode. The unknown and all standard additions were made up to the same final volume. 1. Plot absorbance as a function of the concentration of Cu (II) standard. Determine the equation of the line and the X intercept. Find the concentration of Cu(II) in the water.arrow_forward
- Si sample of unknown doping, Hall measurement has been made and thefollowing information obtained: W = 0.05 cm, A = 1.6 x 10-3 cm2, I = 2.5 mA, and the magnetic field is 30 nT (1T = 10^-4 Wb/cm2). If a Hall voltage of +10 mV is measured, find the Hall coefficient, conductivity type, majority carrier concentration, resistivity, and mobility of the semiconductor sample. Plz, don't answer who don't know exactly.arrow_forward1. A compound has a molar absorptivity of 3.031 x 10° L cm1 mol1. If a 15.00 mm-length cell is used to hold the sample, and a transmittance of 19.53 % is measured, what is the molarity of the compound in solution?arrow_forwardAt 520 nm with a 1.00 cm cell a 8.24 ppm solution of KMnO4 has a transmittance of 0.126. What is the molar absorptivity of KMnO4 at 520 nm?arrow_forward
- Calculate the expected absorbance value of a 0.39 M aqueous solution of a solution if the extinction coefficient is ε = 2.95 dm3 mol–1 cm–1. The path length of the solution cell used for the measurement is 1.00 cm.arrow_forwardThe observed intensity of light (I) after passing through the sample cell is 0.176 of the initial intensity (I0) from the light source. The absorbance (A) of the sample solution is Report your answer to 3 significant figures.arrow_forwardA solution containing 8.75 ppm KMnO4 has a transmittance of 0.743 in a 1.00 cm cell at 520 nm. Calculate the molar absorptivity of KMnO4.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning