Carbomer, should I assume they started with 100%?

It says 18% NaOH solution, the NaOH that I bought is 90% Pure, I am going to email them to get exact information but should I assume there Sodium Hydroxide is 99% Pure


  • @sean9980 You can make a solution dissolving your 90% NaOH in enough water to get the 18% solution of NaOH. 
  • BelassiBelassi Member, PCF student
    It really is quite simple. Make two experiments. Assume they used 99% pure in (1) and 90% in (2). Measure the resulting pH and viscosity.
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  • MarkBroussardMarkBroussard Member, Professional Chemist

    The purity of your NaOH is not really of any significance.  Of course, higher purity means less "contaminants" ... but, for these purposes the issue is getting enough NaOH into the mix to raise the pH to the point where the Carbomer will gel.  It really does not matter if you use 90% NaOH, 99% NaOH, an 18% solution or a 25% solution as long as you raise the pH sufficiently for the Carbomer to activate and gel.
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