Chemistry Lab Question?

Posted on 2014-11-29 12:30:00 in Chemistry by JOHN

Q 1. You have a container with NaCl and Na2CO3, but you don't know which is which, so what chemical reaction can you do to find out? Or what test?

Q 2. Individuals with high blood pressure often use seasoning products that are advertized as "low salt". These products often contain postassium chloride as a sub for sodium chloride. From a chemical stand-point are these products "low salt"? Why can the manufacturers claim that these products are low salt?

Q 3. You find a mysterious substance A. You think it is table talk, so you dissolve it in tap water and find that a white precipitate forms when silver nitrate is added. Why would someone doubt your results that it is not table salt?

Q 4. What is the identity of the salt if all below occurs?

a) white , crystalline-like solid readily dissolved in water,
b) reaction with NaOH a gas evolves which turned moist red litmus paper blue
c) when the unknown was heated with concentrated sulfuric acid, a colorless gas evolves.
d) An aqueous solution of the salt produced a white precipitate when aqueous silver nitrate solution was added.

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