The following plot shows two pH titration curves, each representing the titration of 50.0 mL of 0.100 M acid with 0.100 M NaOH:

. (a) Which of the two curves represents the titration of a strong acid? Which represents a weak acid?

Video transcript

Hi everyone for this problem. It reads shown below are the tight rations curves of two acids, each with a concentration of 20.5 molar. A 40 millimeter sample of each acid was titrate, ID with 400.5 molar of potassium hydroxide identified the tight rations curve that depicts a strong acid. And the tight rations curve that depicts a weak acid. Okay, so looking at this graph here, we need to identify which one is the strong acid and which one is the weak acid. And we have two curves. Okay, so let's go ahead. And for a strong acid we know that a strong acid is going to have a low P H. Okay, so what this means is for a strong acid, the curve starts at a low P H. Okay, so looking at the two curves in this graph, we want to choose the lower curve for the strong acid. Okay, However, for a weak acid, a weak acid is going to have a higher P. H. Than a strong acid. Okay. And so we'll say here that the curve starts. The curve starts at a higher P. H. Okay, so in this sense then when we compare the two, this is going to be the higher curve. Okay, and here this is going to be the lower curve. So let's take a look at our titillation curve. So we'll say here that the lower curve is the strong acid and this higher curve is the weak acid and we'll go ahead and highlight that here. Okay, and the explanation is written over to the right as to why that is it for this problem? I hope this was helpful.