fareloz
Forum Replies Created
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And what are the myths? The title is not related to actual posts at all. It feels like another ad of your business.
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Disclaimer: not a chemist here
pKa of an acid is pH value when half of the acid is still an acid and half is “neutralized” to conjugated base. For example if we take lactic acid, it’s pKa is 3.86. So if we take pure lactic acid solution and adjust it’s pH with NaOH to value 3.86 that will mean we have half of original lactic acid and half converted to Sodium Lactate.
Now when we talk about pKa of combined solution I don’t completely understand what this should mean and moreover what application it could have. Thinking logically we can extend pKa definition and say that pKa of combined acids solution is the pH value when half of combined solution is “neutralized”.
The problem here is it doesn’t mean that each specific acid is also half-neutralized under this value. In case of a mix of very strong acid and some weak acid it means strong acid will be neutralized almost completely with part of the weak acid.
Anyway, if we agree on definition above. I think pKa of combined solution depends on pKa of each acid adjusted by it’s concentration. I don’t think there is a trivial formula especially if the acids can interact affecting their individual pKa values.
Still I’m wondering how you want to use this measure…
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To me Sorbitol is much stickier and more costly to buy than just Glycerin
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I remember AXE advertisement in my country where a guy was spraying it all over the body in shower and then girls were literally sticking to him. So yes, I think it is just a marketing.
There might be some ingredients exposure limits (like it is allowed only under pits, but the whole body is too big surface and exposure) but I doubt it
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People earn money with this and you want get it for free?)
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No
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Your life is so wild ????
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No
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Simple answers:
1. No, most customers do not care about preservatives (and INCI in general)
2. To compete with big brands the small ones have to come up with marketing stories, one of them is fearmongering about preservatives (and other components like SLS or silicones)
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Glycerol/Glycerin and Xylitol are sticky.
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I guess it is a lotion that you apply in shower on wet skin before the towel
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Why not using plain old SLS? And thicken it up with table salt?
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Are you sure it is Betaine Salicylate and not Allantoin? 2% is very high, Allantoin has weak solubility in water, I usually add not more than 0.5% of water content (not the whole formula). Try making a test batch without it and see if it helps
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I don’t have an exact answer, but my limited chemistry knowledge says that:
1. Weak acids react slower than the strong ones. Maybe some very weak acid + baking soda will react long enough?
2. Speed of the reaction depends on the temperature. Cooling down the medium will result in slower reaction
Also, another approach could be if you have some equipment to slowly add acid to the baking soda
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Yes, you should use a preservative.
And be aware that high polysorbate content gives unpleasant soapy feel on the skin
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The rule is simple - you list ingredients you put, not the outcome of their reaction. E.g. if you put Salicylic acid and NaOH - you list them, you don’t list their product of reaction Sodium Salicylate.
Same here. If you put CCT - you list it.
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It is stated in the comments - iron ions from bentonite, salicylic acid reacts with iron and creates this purple color.
If you get same result without bentonite that most likely you have water not deionized enough
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Hi Perry!
Are there any rules on the forum?
I see the OP all over the forum promoting his brand. Is this allowed? -
Yes
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Hmm, not sure why you answered to this comment, but I was answering to the topic starter. No one was talking about you and your business.
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Don’t ruin the moment of fame for the guy. He’s been 40 years in science and even has become a co-founder of a company just to write these titles in every message on this forum)
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It may be compatible or lose viscosity over time, do stability testing
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It means the opposite, metal ions decrease viscosity
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Metal ions can break polymers like Carbomer. That’s why many polymers are advertised by showing viscosity with added table salt (NaCl)
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The reason they are less sustainable is that you have to spend a lot of water, soil and processing power to make natural ingredients. Then shorter storage time and quick spoilage leads to more amounts of waste.
Synthetic ingredients are easier to manufacture, control quality and store. It requires much less resources and processing power.