If you are waiting for a response to an e-mail or comment, I'm getting around to it. I think I'm a month behind on e-mail, and almost two weeks back on comments. If you wrote to me before that time, please feel free to send it again, or watch this weekend for your comment here! As a note, please subscribe to the post in which you've written your comment so you can see if it's been answered. I might not get to it as a Weekend Wondering, but I try to answer every comment that comes in. If you are a business and have written to me asking me to write a formulate for you, I haven't responded because I've asked you not to ask. If you've asked a question, then I just haven't gotten around to it.
I get mine from Voyageur Soap & Candle or Soapcraft.ca, but if you check the FAQ and scroll down a bit, you'll see there's a list of suppliers from all around the world, and there's bound to be somewhere local to you. I really can't stress enough how much you want to consult those lists because if you ask me where I get my supplies, odds are pretty good I'm going to tell you about a Canadian supplier (and usually it's Voyageur Soap & Candle or Aquarius Aroma & Soap).
There are tons of reasons to go to the FAQ, but I've included some basics you might want to purchase when you're starting out!
As well, if you're in Europe, take a look at Eucalypta's list of European suppliers. She did a killer job of putting this together.
In this post on salicylic acid, Sanziene notes she'll be using salicylic acid with propylene glycol because it's more soluble, but...I have no idea how to read the chart ... I want to dissolve 2% salicylic acid, how much propylene glycol should I use?
You might recall the posts on solubility. (If not, click here and click here.) For solubility we have to consider how soluble something is and whether it's soluble in water, alcohol, oil, and other liquid-y things. If you look at the chart above, we can see that it says % w/v, which means percentage weight to volume. So when we try to dissolve salicylic acid in distilled water, about 0.185% or 0.185 grams dissolves into it. (That's really low!)
I think this is a better chart, although you have to figure out the molarity of salicylic acid.
1.592 M, which means 1.592 moles of salicylic acid dissolves in 1 litre of propylene glycol. A mole of salicylic acid weighs 138.12 grams, which means we can dissolve 219.88 grams of salicylic acid in 1 litre of propylene glycol. (1.592 M x 138.13 grams = 219.88 grams per litre). So we could dissolve 21.988 grams in 100 ml or 2.1988 grams in 10 ml (2 tsp). (I prefer molarity over the whole w/v thing.)
We can dissolve 0.014 moles or 1.93368 grams (let's round to 1.93 grams) in 1000 ml or 1 litre, which works out to 0.193 grams in 100 ml of water, which is almost the 0.185 grams we see in the chart above.
If we compare this to distilled water, we can dissolve 0.185 to 0.193 grams in water and 2.20 grams in propylene glycol. Big difference, eh?
I'll go into moles and molarity later this week on Chemistry Thursday! The short summary is that molarity or M is the number of moles of something divided by volume. I promise all will become clear soon...
Converting percentages to weight
I'm off to teach the kids of Yarrow how to make adorable zippered bags with my mom, so I best shower and get going! See you later with more comments!