isohexane

I did my base extraction rescently. Two kinds of isohexane were used: cas 64742-49-0 and cas 107-83-5. I really don't like this isohexane cas 64742-49-0 as it has higher boiling range 70/85 than cas 107-83-5, and I have strong feeling its ebulioscopic constant is some higher as well. But this...