Hamzah Siddiqui (H2CO3)

Carbonic acid is an acid because it has hydrogen and also a ternary ionic compound because it has more than 2 elements. It is found in rain water naturally in the air. Carbonic acid is also found in carbonated drinks like sprite and 7UP. It adds that unique sharp tasting edge in those drinks.

http://www.cooksinfo.com/carbonic-acid

Johnson, Julian Ammonium Sulfate (NH4)2SO4

Ammonium Sulfate is binary ionic. This compound is commonly used to promote plant growth, but when too much is used alkaline levels in the soil raise and the plants tend to die. Aside from plant growing ammonium sulfate is a key ingredient in fire extinguishers. Also, ammonium sulfate is commonly used in flooded soil in the process of growing rice. 

 Ammonium sulfate pdf