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Example Questions
Example Question #149 : Reactions And Equilibrium
Put the following acids in order of their INCREASING acid strength: HI, HCl, HBr, HF.
HF, HBR, HI, HCl
HF, HCl, HBr, HI
HI, HBr, HCl, HF
HCl, HBr, HI, HF
HI, HCl, HBr, HF
HF, HCl, HBr, HI
Larger halogen size leads to greater acidity because of weaker H-X interactions.
Example Question #1 : Molecular Structure Of Acids And Bases
Put the following acids in order of their INCREASING acid strength: HCl, HS, HBr, H2Se.
H2S, HCl, HBr, H2Se
H2Se, HBr, HS, HCl
H2S, H2Se, HCl, HBr
HCl, HS, HBr, H2Se
HBr, H2Se, HCl, H2S
H2S, H2Se, HCl, HBr
Acid strength increases from left to right across a period and increases going down a group.
Example Question #82 : Reaction Types
Put the following acids in order of their DECREASING acid strength: HOCl, HOBr, HOI, H2O.
HOCl, HOBr, HOI, H2O
H2O, HOI, HOBr, HOCl
HOCl, H2O, HOBr, HOI
H2O, HOCl, HOBr, HOI
HOI, HOBr, HOCl, H2O
HOCl, HOBr, HOI, H2O
Acid strength of an oxy acid increases with increasing electronegativity on the halogen.
Example Question #2 : Molecular Structure Of Acids And Bases
Put the following acids in order of their DECREASING acid strength: HOCl, HO2Cl, HO3Cl, HO4Cl.
HO4Cl, HO3Cl, HO2Cl, HOCl
HO4Cl, HOCl, HO2Cl, HO3Cl
HOCL, HO2Cl, HO3Cl, HO4Cl
HO2Cl, HOCl, HO3Cl, HO4Cl
HOCl, HO4Cl, HO2Cl, HO3Cl
HOCL, HO2Cl, HO3Cl, HO4Cl
For an oxyacid, the acid strength increases as the number of oxygens increase.
Example Question #3 : Molecular Structure Of Acids And Bases
Put the following in order of INCREASING acid strength: H2Se, KH, AsH3, HBr.
KH, AsH3, H2Se, HBr
AsH3, H2Se, KH, HBr
HBr, H2Se, AsH3, KH
KH, H2Se, AsH3, HBr
AsH3, H2Se, HBr, KH
KH, AsH3, H2Se, HBr
Acid strength increases going across a period.
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