Thank you for changing the question after I answered. I'm sure the group is impressed by your brilliance in the face of my shortcomings if they don't notice the time stamps.
OK. Lets try again.
Is there a way to analyze
Often there is.
the purity of benzocaine
Sure. To what standard do you need this answer? Are you a manufacturer, and need to know to a government standard? You posted in High School originally? Is this a school assignment? What do you know already, and what specific questions do you have?
in a quantitative way?
As an alternative to what? Do you know the other analytical options?
Synthesis: http://imgur.com/a/DFqK1
That is a reaction in chemical shorthand. It doesn't specify analytical information. Can you read it and understand it? Do you realize that posting the synthesis, and asking for analytical methods, is like asking for a car repair manual, in order to learn how to drive?
Kindly trouble yourself to review the
Forum Rules{click}. You agreed to these rules as a condition of signing up for our forum, and they apply to you, whether you agree with them or not, or even if you're unaware of them.
You haven't asked a complete question. My terse answer was meant to let you know this. This isn't a druggie kiddie forum. If you can understand the pathway, and can ask specific questions, we can help. If you're looking for recipes, then we won't.