Chemistry Practice Problems Identifying Acids and Bases Practice Problems Solution: Which of the following is a weak acid?A)  H2SO4   ...

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Solution: Which of the following is a weak acid?A)  H2SO4            B)  HNO3                             C)  HF                                   D)  HBr                                E)  HCl

Problem

Which of the following is a weak acid?

A)  H2SO4            

B)  HNO3                             

C)  HF                                   

D)  HBr                                

E)  HCl

Solution

We’re being asked to identify which among the given acids is a weak acid.


Weak acids are weak electrolytes that don’t completely ionize but instead reach a state of equilibrium. 


However, it’s easier to identify strong acids than familiarize yourself with all the weak acids (since the common strong acids have rules and are relatively fewer).


Strong acids are considered strong electrolytes. They completely dissociate into ions when dissolved in water.

Strong binary acids – paired with a highly electronegative atom

Strong binary acids are:              HCl, HBr, and HI

Strong oxyacids (or oxoacids) - have 2 or more oxygens than hydrogens

Oxyacids → possess H+ ion, connected to nonmetal and oxygen

Common strong oxyacids are:                  HNO3, HClO3, HClO4, H2SO4

Exceptions to the rule are:                            Oxalic acid (H2C2O4and Iodic acid (HIO3)

▪ both have 2 more O than H but are weak acids because carbon and iodine have low electronegativity

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