KNO3 is an ionic compound because it is formed by two ions, K+ and NO3–. These positive and negative ions produce the force of attraction between them which results in an ionic bond.
Moreover when the metal combines with nonmetal, it usually forms an ionic compound. Here, K is a metal and NO3 is a group of nonmetals. So when they combine, it forms an ionic compound.
Well, now you have got to know that KNO3 is an ionic compound, but let me explain the in-depth reason why KNO3 is an ionic compound.
If you are a visual learner like me, then here is a short one minute video for you.
Why is KNO3 an ionic compound?
As mentioned above, you can simply remember that when the metal combines with nonmetal, the bond between them is an ionic bond.
Here in KNO3, the K atom is a metal and the NO3 is a group of nonmetals.
Hence the bond between them is an ionic bond.
But how does the ionic bond form between K and NO3?
When K and NO3 combine with each other, the electron transfer takes place from K to NO3.
In other words, K loses 1 electron and the NO3 gains 1 electron.
Due to this, the Potassium becomes a positive ion (K+) and NO3 becomes a negative ion (NO3)–.
Now because of the positive charge of Potassium ion and negative charge of NO3 ion, the electrostatic force of attraction is produced between them.
This electrostatic force between K ion and NO3 ion results in an ionic bond between them.
Hence, KNO3 is an ionic compound.
I hope you have understood the reason why KNO3 is an ionic compound.
Check out other compounds to see whether they are ionic or covalent;
Is PH3 Ionic or Covalent?
Is NBr3 Ionic or Covalent?
Is NaCl (Sodium chloride) Ionic or Covalent?
Is CO2 (Carbon dioxide) Ionic or Covalent?
Is H2O (Water) Ionic or Covalent?
Jay is an educator and has helped more than 100,000 students in their studies by providing simple and easy explanations on different science-related topics. With a desire to make learning accessible for everyone, he founded Knords Learning, an online learning platform that provides students with easily understandable explanations.
Read more about our Editorial process.