Metal finishing Q&As since 1989

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W/w conversion to w/v

Hi, I'm working on a research project and I need to convert 0.2 w/w % copper as copper sulphate [on eBay or Amazon]into w/v, would you help me with that please.
Many thanks

Eman Alissa
researcher - Jeddah, KSA
March 9, 2009

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First of three simultaneous responses --

Give us the whole problem. Is the weight as copper, a copper salt, hydrated or not hydrated, a solution, what solvent.

James Watts
- Navarre, Florida
March 11, 2009

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Second of three simultaneous responses -- March 12, 2009

Hi
At the concentration you are using, there is no practical difference between w/w and w/v. The calculation is:
w/v = w/w x Specific Gravity
A table for copper sulphate gives 20 g/l (2% w/v) a SG of 1.01. So, your solution would be ~ 1.001 SG. In other words, the difference would be in the order of 0.1%. As solutions become more concentrated the difference does become significant.

Harry Parkes
- Birmingham, UK

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Third of three simultaneous responses --

0.2% w/w is two grams per kilogram of solution.

0.2% w/v is two grams per liter of solution.

If you are talking about a solution of copper in water, the two are virtually identical.

Dave Wichern
Consultant - The Bronx, New York
March 14, 2009

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For passivation chemicals, I want to know how to convert W/W TO GRAM PER LITRE

REGARDS

Prakash Govindarajan
plating shop employee - Belgaum, India
February 21, 2011