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 (H2C2O4) and Iodic acid (HIO3)
▪ both have 2 more O than H but are weak acids because carbon and iodine have low electronegativity
Let’s take a look at each of the given compounds:
KOH, KNO3, KCN, NH4Cl, HCl
B) KNO 3
• NO3- → Conjugate base of strong acid
• Neutral salt
• NO3- → Conjugate base of weak acid
• NH4+ → Conjugate acid of weak base
• Acidic salt
• one of the strong binary acids
• Strong Acid
Arrange the following 0.10 M solutions in order of most acidic to most basic.
KOH, KNO 3, KCN, NH4Cl, HCl
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Identifying Acids and Bases concept. You can view video lessons to learn Identifying Acids and Bases. Or if you need more Identifying Acids and Bases practice, you can also practice Identifying Acids and Bases practice problems.
What professor is this problem relevant for?
Based on our data, we think this problem is relevant for Professor Bell's class at PSU.
What textbook is this problem found in?
Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.