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Related Concept Videos

Weak Base Solutions03:21

Weak Base Solutions

24.9K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
24.9K
SFG Algebra01:16

SFG Algebra

325
In Signal Flow Graph (SFG) algebra, the value a node represents is determined by the sum of all signals entering that node. This summed value is then transmitted through every branch leaving the node, making the SFG a powerful tool for visualizing and analyzing control systems.
Each node in an SFG corresponds to a variable, and the interactions between nodes are represented by branches with associated gains. When multiple branches lead into a node, the value at that node is the sum of the...
325
Weak Acid Solutions04:02

Weak Acid Solutions

42.4K
Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
42.4K
Titration of a Weak Acid with a Weak Base01:08

Titration of a Weak Acid with a Weak Base

4.9K
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
4.9K
Improving Translational Accuracy02:07

Improving Translational Accuracy

14.1K
Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
14.1K
Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

49.1K
Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
49.1K

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Related Experiment Videos

Detecting weak signals from interfaces by high accuracy phase-resolved SFG spectroscopy.

Martin Thämer1, R Kramer Campen, Martin Wolf

  • 1Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, 14195 Berlin, Germany. thaemer@fhi-berlin.mpg.de.

Physical Chemistry Chemical Physics : PCCP
|October 6, 2018
PubMed
Summary

A new spectrometer design enhances vibrational sum frequency generation (v-SFG) spectroscopy. This advancement improves phase and amplitude accuracy, enabling detection of weak interfacial signals with greater precision.

Related Experiment Videos

Area of Science:

  • Surface Science
  • Spectroscopy
  • Nonlinear Optics

Background:

  • Vibrational sum frequency generation (v-SFG) spectroscopy is a powerful tool for characterizing interfacial species.
  • Determining the complex second-order susceptibility is crucial for v-SFG analysis.
  • Current limitations in phase and amplitude precision hinder the detection of low-contribution species.

Purpose of the Study:

  • To introduce a novel spectrometer design for enhanced v-SFG spectroscopy.
  • To improve phase and amplitude accuracy for interfacial species characterization.
  • To enable studies involving multiple spectral acquisitions and sample modifications.

Main Methods:

  • Utilizing a full collinear beam geometry for v-SFG.
  • Implementing broadband spectral sampling.
  • Simultaneously measuring complex sample and reference spectra.
  • Employing balanced detection techniques.

Main Results:

  • Achieved unprecedented phase and amplitude accuracy in v-SFG measurements.
  • Significantly reduced uncertainties in reference phase and amplitude.
  • Increased signal-to-noise ratio by an order of magnitude.
  • Successfully isolated a weak isotropic surface signal from z-cut quartz.

Conclusions:

  • The new spectrometer design substantially enhances the sensitivity and precision of v-SFG spectroscopy.
  • This advancement allows for measurements previously not feasible.
  • Enables more detailed studies of interfacial structure and dynamics.