Which of the following pictures represents a solution of a weak diprotic acid, H2A? (Water molecules have been omitted for clarity.) Which pictures represent an impossible situation? Explain.

(a) (b) (c) (d)

Video transcript

Hello. In this problem we are asked to determine from the following pictures which represents the solution of a week, die protic acid and which represents unlikely scenarios. We are told to note that the water molecules are omitted. For clarity. Let's begin by considering the reaction between our di protic acid and water. So that means it will undergo hydraulic sis. Given that this is an acid, it will donate a proton to water. We therefore form hydrogen mines and the conjugate base of our acid. So in the images above, we are looking then for the presence of our die protic acid, the presence of hydro nia mines and also the conjugate base. So making note of the key that is shown above the figures will begin with D. So in the case of D we see that we have hydrogen minds present and we also have our conjugate base present. But there are no di protic acid molecules present. So that means then that D. Is an unlikely scenario if we now move to see we see that we have again hydrogen mines present, we have our die protic acid present and we do have are conjugate base present. But in addition we also have A 2 - and we see that we have More a 2 - than we have of our conjugate base. And so this is also an unlikely scenario if we move then to be we have hydrogen minds present, we have our Die protic acid present and we have a 2 - present but there is no conjugate base present. So that means that B. Is also an unlikely scenario. If we go to a. We now see that we have hydro nian minds present. We have our die protic acid and we have are conjugate base and so A is representative. Bye bye, weak acid, weak die protic acid. So if we look at the solutions that we have been provided A says picture A. L. Streets a week die protic acid while pictures B. C and D. Are unlikely scenarios. And so that is what we said above. So A is the correct answer. If we look at the rest of them be says pictures B, C and D. Illustrated weekday protic acid while A. Is unlikely that is the exact opposite of what we said. So that's incorrect. C says all four pictures illustrate a week die protic acid. That is also not correct. So we are missing components to illustrate a week die protic acid or we have those in excess that do not represent a weekday product acid. And then it says all four pictures are unlikely scenarios. That's also incorrect. Since we did identify A as being a representation of a week die protic acid. Thanks for watching. Hope this helped