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Titration in Nonaqueous Solvents

Titration in Nonaqueous Solvents

Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...

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Updated: Jun 6, 2025

Preparation of Binary and Ternary Deep Eutectic Systems

Preparation of Binary and Ternary Deep Eutectic Systems

Published on: October 31, 2019

Alternative Solvents for Life: Framework for Evaluation, Current Status, and Future Research.

William Bains^1,2, Janusz J Petkowski^1,3,4, Sara Seager^1,5,6

¹Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.

|December 3, 2024

Summary

Water is a likely solvent for life, but other liquids like sulfuric acid and carbon dioxide may also support extraterrestrial biology. This research offers a framework to assess alternative solvents for life beyond Earth.

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Area of Science:

Astrobiology
Biochemistry
Planetary Science

Background:

Life requires a dense fluid solvent, with liquid water being the assumed solvent for extraterrestrial life.
Alternative solvents are hypothesized to be cosmically abundant and capable of supporting life's chemistry.

Purpose of the Study:

To present a new framework for analyzing candidate solvents for life.
To evaluate suggested solvent candidates based on occurrence, solvation, solute stability, and chemical functionality.

Main Methods:

Developed a semiquantitative framework assessing chemical properties and biochemical function of solvents.
Categorized solvent candidates using four key criteria.

Main Results:

Protonating solvents (water, sulfuric acid) meet all chemical requirements for life's solvent.
Water and concentrated sulfuric acid are abundant on rocky planets.
Liquid carbon dioxide is a notable non-protonating solvent with potential for life.

Conclusions:

The framework aids in prioritizing experimental research for astrobiology.
Exploration of alternative biochemistries and solvent adaptability is crucial for understanding habitability.
Liquid CO2 warrants further investigation as a potential solvent for life.