CHEM 001 Lecture Notes - Lecture 21: Ammonia, Weak Base, Conjugate Acid
17 Sep 2020
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Ex of a weak acid: ch3cooh(aq) + h2o(l) h3o+(aq)+ch3oo-(aq) Every acid has a conjugate base and every base has a conjugate acid since each product besides hydronium or hydroxide of the acid/base+water reaction can pick up or donate its proton (making it a base or acid respectively) Ka is called the acidity or ionization or dissociation constant. Acidity and basicity constants are often given as their negative logs. So -logka=pka the stronger the acid, the weaker its conjugate base (since strong acids tend to heavily dissociate in water) the stronger the base, the weaker its conjugate acid. Ex: for the equation for ammonia above, nh4. + is the conjugate acid and you use. Kb since nh3 is a base if you start off with nh4 with an acid. + and h2o, you have to use ka since you start off.
