• Formulating

  Ph buffer at ph 6.80- 7.20

  Posted by Research1 on October 4, 2022 at 11:25 pm

  I am having a problem with my lotion. The ph suppose to be around 6.80-7.20. But it keep going down. I suspect it ia cause by the perfume. I had try to use tea and sodium citrate. But not really working. Plus sodium citrate causes the viscosity to drop also. Any suggestion what raw material suitable to use?

  Pharma replied 8 months ago 4 Members · 3 Replies

  • buffer
  • lotion
  • ph
• 3 Replies

• 

  ketchito

  Member

  October 5, 2022 at 12:03 pm

  @Research1 That I remember, Sodium citrate is used to make acidic buffers. I’d be better to know what else you have in your formula, but you could try adding Sodium bicarbonate (low amounts).

• 

  OldPerry

  Professional Chemist / Formulator

  October 6, 2022 at 2:21 pm

  You’ll need to post all the ingredients in your formula if you want to get any useful answers.

• 

  Pharma

  Member

  October 6, 2022 at 6:49 pm

  That pH range offers room for a fair amount of suitable buffers.

  I’m not a fan of carbonate buffers due to a possible formation of carbon dioxide.

  As @Perry said: No complete formula = no useful advice.

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