CHM110H5 Lecture Notes - Lecture 1: Ammonium Chloride, Buffer Solution, Equivalence Point
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Titration curves for strong acid v weak base. This time we are going to use hydrochloric acid as the strong acid and ammonia solution as the weak base. Because you have got a weak base, the beginning of the curve is obviously going to be different. However, once you have got an excess of acid, the curve is essentially the same as before. At the very beginning of the curve, the ph starts by falling quite quickly as the acid is added, but the curve very soon gets less steep. This is because a buffer solution is being set up - composed of the excess ammonia and the ammonium chloride being formed. Note: you can find out more about buffer solutions by following this link. However, this is a very minor point in the present context, and you would probably do better to read the whole of the current page before you follow this up.
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