Ach has a positive charge on the Nitrogen. This makes it harder for Ach to pass through lipophillic membranes which are nonpolar. Remember likes attract likes. Ach would prefer a polar environment...
No. 10 percent ammonia is simply a solution of ammonia in water. An ammonium compound is a kind of compound formed by reacting ammonia with certain organic compounds.
Yes, but only when suspended (dissolved) in water. Compare Ammonium Fluoride - solid (NH2F) - with NH2F in water - gives NH2+ and F- , an ionic compound.
Ammonium nitrate is a compound because it contains two or more elements (three in this particular case) chemically bonded to one another in a fixed ratio and with a definite structure.
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