What Does v/v, w/w, and Normal Mean in Relation to Molarity and Solutions?

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Discussion Overview

The discussion revolves around the meanings of v/v, w/w, and normal in relation to molarity and solutions, specifically in the context of chemical concentrations such as sulfuric acid and silver nitrate. The scope includes conceptual clarifications and practical applications for purchasing chemicals.

Discussion Character

  • Conceptual clarification, Homework-related

Main Points Raised

  • Some participants explain that v/v refers to volume to volume, indicating a percentage of a solution based on the volume of solute compared to the total volume of the solution.
  • Others clarify that w/w denotes weight to weight, representing a percentage based on the weight of the solute relative to the total weight of the solution.
  • A participant mentions normality in relation to molarity but does not provide a detailed explanation, suggesting that further resources may be needed for clarity.
  • One participant expresses a need for assistance in understanding these terms to make informed decisions when purchasing chemicals.

Areas of Agreement / Disagreement

Participants generally agree on the definitions of v/v and w/w, but there is no consensus on the explanation of normality, and the discussion remains unresolved regarding its relationship to molarity.

Contextual Notes

Limitations include the lack of detailed explanations for normality and its connection to molarity, as well as the absence of specific examples or calculations to illustrate the concepts further.

Who May Find This Useful

This discussion may be useful for individuals seeking to understand chemical concentrations, particularly those involved in chemistry education, purchasing chemicals, or preparing solutions.

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Examples: Sulfuric Acid 93%, Sulfuric Acid 5% v/v Aqueous Solution, Sulfuric Acid 10% w/w Aqueous Solution, Silver Nitrate 0.025 Normal.

How do I relate this to molarity and what does v/v, w/w, and normal mean?
 
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Any help? I just need to know so that I can choose when purchasing chemicals.
 
v/v means volume to volume, so it would be 5% by volume sulfuric acid, and 95% by volume water (aqueous).

w/w means weight to weight, so 10% by weight sulfuric acid and 90% by weight water.

Here's a site that actually offers explanations to all your questions, and it does a better job than I could explaining normality.

http://environmentalchemistry.com/yogi/chemistry/MolarityMolalityNormality.html
 
Thanks a lot Moonbear!
 

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