Reducing in this context means decreasing in amount or intensity.

  • Thread starter Thread starter RJ Emery
  • Start date Start date
Click For Summary
SUMMARY

The discussion clarifies the distinction between "salty" and "saline," with "saline" referring specifically to salts like sodium, potassium, or magnesium, while "salty" pertains to sodium chloride (NaCl). It emphasizes that the term "reduce" in a scientific context indicates the gain of electrons by an atom or molecule, contrasting with "oxygenating," which signifies the loss of electrons. The excerpt from Richard Corfield's "Lives of the Planets" illustrates these concepts through the comparison of Mars' surface conditions to early Earth, highlighting the implications for potential life on Mars.

PREREQUISITES
  • Understanding of basic chemistry concepts such as oxidation and reduction.
  • Familiarity with the terms "saline" and "salty" in a scientific context.
  • Knowledge of the environmental conditions on early Earth and Mars.
  • Awareness of extremophiles, specifically acidiphiles, and their adaptations.
NEXT STEPS
  • Research the chemical processes of oxidation and reduction in detail.
  • Explore the role of extremophiles in astrobiology and their implications for life on other planets.
  • Investigate the geological history of Mars and its atmospheric conditions.
  • Study the physiological adaptations of acidiphiles and their evolutionary significance.
USEFUL FOR

This discussion is beneficial for students and professionals in the fields of astrobiology, chemistry, and planetary science, as well as anyone interested in the conditions necessary for life on other planets.

RJ Emery
Messages
114
Reaction score
6
What is the difference between salty and saline?

And in the context below, what is meant by reducing?

Consider the following excerpt:

Yet the largest question of all remains unanswered -- did Mars once harbor life? At the present time, the evidence seems stacked against it, for both [Spirit's and Opportunity's] data suggest that the surface of Mars is, and perhaps always was, oxygenating, acidic, and saline. Compare this situation with that on Earth at the time life got started. The atmosphere here then was reducing and with a neutral pH. The oceans were salty rather than saline.

Today's Earth does host extraordinary single-celled organisms that can live in very acidic environments -- the so-called acidiphiles. But, although they can live in concentrated sulphuric acid with a pH of 1, inside the cell the pH is a neutral 7, just as it was when their remotest ancestors evolved in the primordial sea of Earth. Acidiphiles have evolved sophisticated ion pumps across their cell membranes that protect them from the unbelievable harshness of their environment. Could they have originally evolved in such acidity? Probably not.

(end quote)

From Lives of the Planets: A Natural History of the Solar System, by Richard Corfield, 2007, Basic Books, ISBN 0465014038, Chapter 5, The Martian Chronicles - Mars, pp. 132-133.
 
Chemistry news on Phys.org
If I remember correctly, saline refers to a salt of sodium, potassium, or magnesium. "Salty," in this context, would refer to NaCl.

The term "reduce" means an atom or molecule gains an electron. The text describes the Mars surface as "oxygenating," a term used to describe a molecule or atom that loses an electron.
 
I agree with lisa, and in scientific terms you don't say "salty" it sounds kinda stupid.
 

Similar threads

What colors and attributes could alien flora & fauna have?
  • · Replies 15 ·
Replies
15
Views
6K
A Critique of “Cosmos” by Carl Sagan
  • · Replies 17 ·
Replies
17
Views
9K