Find the pH of each mixture of acids. a. 0.115 M in HBr and 0.125 M in HCHO2

Video transcript

Hey everyone, we're told that the mixture of 0.14 molar hydrochloric acid and 0.19 moller Hydrofluoric acid has a ph of blank first. We need to recognize that hydrochloric acid is a strong acid and Hydrofluoric acid is a weak acid. And because we have a strong acid, this acid is going to dominate. And we can go ahead and use the concentration of hydro ni um ions from our strong acid in order to determine our ph. So our ph is essentially going to be negative log of our hydrochloric acid. So, plugging in our values, we get negative log of 0.14. And when we calculate this out, we end up with a ph of 0.85387. And since we only have two significant figures, our final answer is going to be 0.85. So I hope this made sense. And let us know if you have any questions.