urea become crystals

smoksmok Member
Urea has been stuck in water for a number of days and has become all
Is a crystal
what happened
Is it still effective?

Comments

  • PharmaPharma Member, Pharmacist
    Which % did you add and what else is in said solution?
  • smoksmok Member
    except water and urea
    50%
  • 50% urea in just water? well that's why 
     That much urea is hard to solubilize, especially since it's endothermic when dissolving.  

  • MarkBroussardMarkBroussard Member, Professional Chemist
    If I recall correctly, the maxiumum solubility of Urea in water is about 17% Urea.  You can easily check the solubility with a simple Google search.
    Chemist/Microbiologist formulating in the Organic & Naturals arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program guidelines focused skincare & haircare products. 

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  • smoksmok Member
    sory i mean 5%
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