For each strong acid solution, determine [H3O+], [OH-], and pH. a. 0.25 M HCl

Video transcript

Hey everyone we're asked for a 0.36 molar hydrochloric solution, calculate our PHP. O. H. And the concentration of our hydro knee um ion and the concentration of our hydroxide ion. So looking at this acid, we can see that we have a strong acid. And as we've learned we know that strong acids disassociate completely. And because they dissociate completely, we can easily determine the concentration of our hydro knee um ion, which essentially is the same as the concentration of our hydro biotic acid initially. So this is going to be equal to 0.36 molar. Now to calculate our ph we can take the negative log of the concentration of our hydro ni um ion. So plugging in that value we get the negative log of 0. which gets us to a ph of 0.44. Now let's go ahead and calculate for our P. O. H. To calculate for our P. O. H, we can take 14 and subtract our ph which is 0.44. Now, when we calculate this out, we end up with a p. h. of 13.56. Lastly we can go ahead and calculate the concentration of our hydroxide ion by taking 10 to the negative P. O. H. So plugging in that value we get 10 to the negative 13.56. So this gets us to a concentration of 2.75 times 10 to the -14 moller which is going to be our final answer. Now I hope this made sense. And let us know if you have any questions.