MadSci Network: Chemistry

Re: How do I make a 1% phenophthalein solution?

Date: Sat Sep 29 14:42:44 2001
Posted By: Arthur Nascimento Junior, Staff, Federal Customs Analysis Laboratory, Universidade do Estado do Rio de Janeiro
Area of science: Chemistry
ID: 1001621504.Ch

Hi Emily

If you have 25 g of phenolphthalein and want to prepare a 1% solution (w/w) you:

    25 g ...................  1 
    x  g (solvent) ......... 100

    where x = 2500 g of ethyl alcohol which corresponds to 3387.5 ml. 

   This solution can be done at room temperature and must be kept in well 
closed bottles.

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