Some basic concept problems

Please explain pointwise.
1.In the chemical changes which I have studied till now , precipitate appears and after adding more reactant, it dissolves. For example--
when ammonium hydroxide is added to copper sulphate solution, a blue precipitate appears. When more ammonium...

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2.Nitric acid Summary

It is true that concentrated nitric acid is a good oxidizer, but the result will be
sulfur dioxide, nitrogen monoxide and water vapor. I guess in a closed system the sulfur could be further oxidized - but the result would be a little bit of weak sulfuric acid in a large amount of concentrated nitric acid and nitrates. This is not an economic setup or result. All one has done here is to contaminate perfectly good concentrated nitric acid.

#3 is clear. Move ahead.

Try to google bisulfate. That is the more common way of saying it. Basically (pun intended) - sulfate has a negative 2 charge and has no hydrogen. Hydrogen sulfate has a negative 1 charge and has a hydrogen.
Dibasic just means that there are 2 hydrogen ions in each molecule.

sodium sulfate and sodium bisulfate make an equilibrium in sulfuric acid.
the way to write it would be:



This is an example like your textbook says "It reacts with alkalis to form acid salts called hydrogensulphates and normal salts called sulphates"

OK, everything cleared. Thank you Eric! and Modest!

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