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QUESTION

What is the formula of sulfurous acid?

##H_2SO_3##

Sulfurous and sulfuric acid are both acids formed from an oxide of sulfur. Generally, in chemical lingo anyway, the suffix -ous is used to describe the acid which has one less atom of oxygen than the -ic acid.

For example, ##color(green)"sulphuric"## acid is ##H_2SO_4"## and ##color(red)"sulphurous"## acid is ##H_2SO_3##.

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