Home Cosmetic Science Talk Formulating Sodium citrate buffer

  • Sodium citrate buffer

    Posted by Mssthng052 on November 10, 2023 at 1:09 pm

    Hello. I’ve created a buffer solution with sodium citrate, citric acid and sodium hydroxide. My buffer pH is 5.4. I want to include it in a clarifying shampoo that should have a final pH of about 5.3-5.4. I found a site that does the calculations for you, so I used:

    Aqua— 100ml

    Sodium citrate— 4.813g

    Citric acid— 1.659g

    Sodium hydroxide—Qs to pH, 0.36g

    Citric acid —0.16g because my ph was then a bit too high so I added a bit more

    Aqua— Qs to total 250ml

    But now what I want to know is when do I add the buffer? Do I do it at the end after I’ve adjusted the final pH or some time before? Note, I do hydrate cationic guar at the end (5.0-5.5), as well as do some heating to 70*C. Please lmk what you can suggest. TIA

    Mssthng052 replied 2 weeks, 5 days ago 1 Member · 1 Reply
  • 1 Reply
  • Mssthng052

    November 10, 2023 at 1:27 pm

    Also, how much should I use in percentage or grams? I see some things that say as low as 0.1% to 5% and that’s a very wide range.

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