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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Precipitation and Co-precipitation01:17

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Precipitation Titration Curve: Analysis01:21

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The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
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Precipitation Reactions03:10

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In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
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Types of Coprecipitation01:10

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Efficient reduction for diagnosing Hopf bifurcation in delay differential systems: Applications to cloud-rain models.

Chaos (Woodbury, N.Y.)·2020
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Exploring the nonlinear cloud and rain equation.

Ilan Koren1, Eli Tziperman1, Graham Feingold1

  • 1Department of Earth and Planetary Sciences, Weizmann Institute, Rehovot 76100, Israel; Department of Earth and Planetary Sciences and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA; and Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, Colorado 80305, USA.

Chaos (Woodbury, N.Y.)
|February 3, 2017
PubMed
Summary

Marine stratocumulus clouds, crucial climate reflectors, exhibit two modes: open and closed cells. Higher aerosol loading, indicated by droplet concentration, drives deeper clouds towards a closed-cell state.

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Area of Science:

  • Atmospheric Science
  • Climate Science
  • Cloud Physics

Background:

  • Marine stratocumulus clouds significantly influence Earth's climate by reflecting solar radiation.
  • These clouds exist in two stable configurations: open and closed cells, a behavior sensitive to environmental and aerosol properties.

Purpose of the Study:

  • To analytically investigate the transition between open and closed cellular states in marine stratocumulus clouds.
  • To understand the system's emergent behavior and its dependence on model parameters like droplet concentration and environmental conditions.

Main Methods:

  • Linear stability analysis was employed to study the transition from steady to limit-cycle states.
  • The study derived analytical expressions for state transitions based on model parameters.

Main Results:

  • A single nondimensional parameter (μ=N/(ατH₀)) links droplet concentration (N), carrying-capacity (H₀), and cloud recovery (τ).
  • Deeper clouds transition to closed cells with increased droplet concentration (higher aerosol loading).

Conclusions:

  • The findings provide an analytical framework for understanding cloud state transitions.
  • This research enhances comprehension of cloud-aerosol-environment interactions and their impact on climate regulation.