Using Sodium Hydroxide with Carbomer and Calculation
ถามโดย: i8i0i8i
เมื่อ: September 15, 2015
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I want to use Sodium Hydroxide instead of Triethanolamine to neutralize Carbomer for gel formation, as Triethanolamine has an odor. I have some questions:
- Is it true that 100 CC = 100 ml = 100 grams for water?
- What is the concentration of Sodium Hydroxide sold on the website?
- What is the safe usage rate for Sodium Hydroxide? I read it's 0.1% to 5%, is this correct?
- How do I calculate the amount of Sodium Hydroxide needed to make a 2.5% solution relative to 500g of water? For example, if using 100% Sodium Hydroxide and if using a hypothetical 80% Sodium Hydroxide?
คำตอบ
Using Sodium Hydroxide with Carbomer
Thank you for your question regarding the use of Sodium Hydroxide with Carbomer as an alternative to Triethanolamine.
Regarding your specific questions:
- Unit Conversion for Water: Your understanding that 100 CC = 100 ml = 100 grams for water is correct.
- Sodium Hydroxide Concentration: The Sodium Hydroxide sold on the website is 100% concentration.
- Sodium Hydroxide Usage Rate: The information you found is correct; Sodium Hydroxide can be used from 0.1% to 5%, and exceeding 5% is dangerous.
- Calculation for Diluted Sodium Hydroxide: Your calculations for preparing a 2.5% solution (relative to 500g of water) are correct:
- Using 100% Sodium Hydroxide: 12.5 grams of Sodium Hydroxide mixed with 500 grams of water.
- Using a hypothetical 80% Sodium Hydroxide: 15.62 grams of 80% Sodium Hydroxide mixed with 500 grams of water.
Sodium Hydroxide is indeed a suitable alkali for neutralizing Carbomer to form a gel, and it is listed as an alternative to Triethanolamine in the product description for Carbomer 940. Using Sodium Hydroxide may help avoid the odor you experienced with Triethanolamine.
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Sodium Hydroxide
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Carbomer 940 (EasyDisperse™, France)
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