Home Cosmetic Science Talk Formulating What is this precipitation

  • chemicalmatt

    April 24, 2024 at 1:48 pm

    @Abdullah It’s been a while since I worked with it but isn’t STPP more soluble in cold water than in hot?

    • Abdullah

      April 24, 2024 at 11:15 pm

      I made two samples, one 10% STPP in hot and one in cold water. The one in hot water dissolved properly with low speed mixing but the one with cold water STPP didn’t dissolve until i heated it a bit.

      These samples were made in glass pot. Surprisingly this time after adding sodium hydroxide, it didn’t precipitate.

      Also, after adding 10% STPP in water, pH was around 7. Is it normal?

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