Which of the following is a means of creating a buffer of H 2 CO 3 /NaHCO 3 ₃?

Hey everyone here we asked which of the following solutions is a buffer. A buffer can be a weak acid and its conjugate base or a weak base and its conjugate acid or a strong base in the weak acid. As long as the weak asset is in high amounts or a strong acid in a weak base. As long as the weak base is in high amounts. So in a way we have K C L. O. And K C L. And these are both conjugate bases but we cannot make a buffer with this because there's no acid for beef. We have H C L. O. Which is a weak acid and then we have N. A. O. H. Was just strong base in order to form a buffer. The weak asset has to be in higher amounts But we only have 100 ml Of the weak acid and 500 ml of the strong base. So this is not going to be a buffer. Percy you have H C L. O. Which is a weak acid and N A L H which is a strong base. Well we have higher amounts of the weak acid because we have 100 ml of the weak acid and 50 millions of a strong base. So this is a buffer. And for d we have H C. L. O. Which is a weak acid and hcl which is a strong acid. You have to assets. So this is not going to be a buffer because there's no base, the left foot. See thanks for watching my video and I hope it was helpful