A solution is prepared by mixing 16ml. of 2.5M #HCl# and 40ml. of 2M #NH_4OH#. What will be the #pH# of the solution if #pK_b# is 4.75? Thank you:)
1 Answer
Explanation:
Ammonium hydroxide is not a discrete substance and is better referred to as "aqueous ammonia"
The
and the no. moles
For which:
These are equilibrium concentrations which, because
Rearranging:
We have a buffer solution here.
Because the total volume is common we can put the no. moles straight into this:
We know that