Posted by Tommy on Wednesday, September 7, 2011 at 4:53pm.
I looked up the pKa for imidazole as 7.00 but you should confirm that in your text or lecture materials. If we call the base BNH2, then
..........BNH2 + HCl ==> BNH3^+ + Cl^-
initial...0.15....0......0..........0
add HCl............x
equil......0.15-x...0....x.........x
Then pH = pKa + log(base)/(acid)
7.30 = 7.00 + log(0.15-x)/x
Solve for x which will be the M HCl you want. I get something like 0.05M
You want 0.500 L of 0.15 buffer so you want 0.075 moles.
0.075 moles imidazole x molar mass = grams.
You can go from here with the amount of HCl to add.
After you finish the calculation take my advice and work the other way to see if adding the materials in your calculation will give you a pH of 7.30
Isn't imidazole c3h4n2 and not bnh2 though?
Related Questions
chemistry - acetic acid: 0.1 M 30ml hydrochloric acid 0.1 M 5 ml sodium ...
Chemistry - A buffer solution is made as followed: i)adding 13.50mL of 0.200mol...
school - What is the pH of 0.1 M formic acid solution? Ka=1.7„e10-4? What ...
chemistry - Choices: True,False. Select all that are True. The pH at the ...
Biochemistry - 1. MES (2-(N-Morpholino)ethanesulfonic acid) is a common buffer ...
Chemistry - TRUE OR FALSE? 1) A solution that is made out of 1.00mol/L ammonia ...
CHEMISTRY - A BUFFER SOLUTION IS MADE FORM 0.10 MOLES NaF AND 0.25 MOLES OF HF ...
Chemistry - IN the polystyrene beaker, mix 20mL of 0.1 M Acetic acid and 25mL of...
chemistry - Write an equilibrium reaction for a buffer system made of the weak ...
Biochemistry - calculate Ph occuring when 100ml of 0.10m acid is added to 500ml ...
For Further Reading
