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Acids and also Bases: molecular Structure and Behavior
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HomeTable the Contents development Molecular framework Ionization Constants salts Buffers Lewis theory Conjugate Acid-Base Pairs listed below are part molecular depictions of assorted acids (the water molecules have been left out). Which ideal represents an aqueous solution of hydrogen cyanate (HOCN, a weak acid)?
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You are watching: Which of the following is a base–conjugate acid pair?

HOCN is a weak acid and will partly ionize in aqueous solutions.
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Good! due to the fact that HOCN is a weak acid, both HOCN and OCN- will be in solution.
HOCN is a weak acid and also will only partially ionize in aqueous solutions.


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The gaianation.netical equation representing the reactions occuring in a hydrogen cyanate equipment is:
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The twin arrow in the above equation represents an equilibrium. This way in the solution, both the forward and also backward reactions are occurring. That is vital to realize the in this solution, reaction are always occuring; reactions carry out not protect against after equilibrium is reached. Under the magnifying glass listed below you deserve to see a representation of the molecules existing in this solution.

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Click on magnifying glass to see a reaction occur. Clicking again will certainly show one more reaction.
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In this representation, you have the right to observe the acidic nature the the HOCN molecule, that is you can see it donate a proton come water. The reverse reaction mirrors the an easy nature that the OCN- ion; you have the right to see it accept a proton from the hydronium ion. HOCN and also OCN- are an instance of a conjugate acid-base pair. The just difference between the 2 is a proton (H+).All acids have a conjugate base and also all bases have a conjugate acid. indigenous the perform of molecule/ion bag below, click those that room conjugate acid-base pairs.
H3O+ / OH- NH4+ / NH3
OH- / O2- H2SO4 / SO42-
H2S / S2- HOBr / OBr-