Textbook Question
Arrange each group of compounds in order of increasing acid strength. Explain your reasoning. (a) HCl, H2S, PH3
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17. Acid and Base Equilibrium
Binary Acids
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Binary acids are formed when hydrogen bonds with a single nonmetal. What is the chemical formula for hydroiodic acid?
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Verified step by step guidance1
Understand that binary acids consist of hydrogen and one other nonmetal element. In this case, the nonmetal is iodine (I).
Recall that the naming convention for binary acids uses the prefix 'hydro-' followed by the root of the nonmetal's name and the suffix '-ic acid'. For iodine, the acid is called hydroiodic acid.
Determine the chemical formula by combining hydrogen (H) with iodine (I) in a 1:1 ratio, since hydroiodic acid is composed of one hydrogen atom and one iodine atom.
Write the chemical formula as \(H I\), indicating one hydrogen atom bonded to one iodine atom.
Verify that the formula does not include subscripts other than 1, as hydroiodic acid is not a polyatomic compound and does not contain multiple iodine atoms bonded to hydrogen.
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