I know that the more polar the bond between the H and A (if HA is an acid) is, the stronger the acid will be.

what does it mean for a bond to be polar?
is a bond more polar if it is more electronegative?
how are bonds polar and how are bonds nonpolar?
what is the difference between polar bonds and nonpolar bonds?

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  1. Look at the electronegativity EN). The only strictly non-polar bonds, and some might argue that even these are not 100% polar, are diatomic or triatomic molecules such as H2, N2, O3, O2, etc. If there is a difference in EN, you know the bond is polar to some degree. Books differ on what is called a 50% covalent/50% ionic bond but the general rule is that about 1.8 or 1.9 difference is a 50/50 bond. Most of the time we call those with a difference larger than 1.8 (more ionic than covalent) ionic and those with less than 1.8 (more covalent than ionic) covalent. Something in the order of 1.0 difference is about 25% ionic/75% covalent. Most personal note book sized periodic charts have a polarity scale graphed. At least mine does. A bond is polar if there is a dipole moment. I hope this helps clear things up.

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