Multiple Choice
What is the name of the acid whose formula is HI? Spell out the full name of the acid.
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3. Chemical Reactions
Naming Acids
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What is the correct name for the acid with the formula H_2S?
A
hydrosulfuric acid
B
hydrosulfic acid
C
sulfurous acid
D
sulfuric acid
Verified step by step guidance1
Identify the type of acid based on the formula H_2S. Since it contains hydrogen and a nonmetal (sulfur) without oxygen, it is classified as a binary acid.
Recall that binary acids are named with the prefix 'hydro-', followed by the root of the nonmetal element, and ending with the suffix '-ic acid'.
For sulfur, the root is 'sulfur', so combining the prefix and suffix gives 'hydrosulfuric acid'.
Compare this with other acid naming conventions: acids containing oxygen (oxoacids) have different suffixes like '-ous' or '-ic' depending on the oxidation state, but H_2S has no oxygen, so these do not apply.
Therefore, the correct name for H_2S is 'hydrosulfuric acid', following the binary acid naming rules.
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