Hi, I want to set up 59% of relative humidity, which salt do I have to use? Thank you very much.
Keep in mind that the RH value is temperature dependent. Try checking those classic papers, I think you will find the answer there:
http://nvlpubs.nist.gov/nistpubs/jres/53/jresv53n1p19_a1b.pdf
http://onlinelibrary.wiley.com/doi/10.1002/jctb.5010170901/pdf
Moreover, some companies offer such solutions commercially, try finding the appropriate one.
Keep in mind that the RH value is temperature dependent. Try checking those classic papers, I think you will find the answer there:
http://nvlpubs.nist.gov/nistpubs/jres/53/jresv53n1p19_a1b.pdf
http://onlinelibrary.wiley.com/doi/10.1002/jctb.5010170901/pdf
Moreover, some companies offer such solutions commercially, try finding the appropriate one.
Try "NaBr"
Reference: books.google.de/books?isbn=0203882954
page 76
Kind regards
Uwe
An aqueous unsaturated solution of CaCl2 at 32.1% w/w can provide 59% of relative humidity for the equilibrium atmosphere over the solution at 25 ºC. Concentration may be not as stable as it could be attained with some alternative saturated salt solution.
Reference:
R. H. Stokes, R. A. Robinson, "Standard Solutions for Humidity Control at 25° C", Ind. Eng. Chem., 1949, 41(9), pp. 2013–2013; or: John A. Dean (Ed.), Lange's Handbook of Chemistry, 15th ed., McGraw-Hill, 1999, p. 11.7.
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