Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: asigna on February 26, 2013, 12:03:24 AM

What is the pH of a 0.25 M methylamine solution?
The formula is ch3nh2
so what I did was .25*2=.5
log(.5)=.30
Calculate the pH of a 0.50 M solution of potassium cyanide
the formula is kcn
I did log(.5)=.30
Am I doing this right? I feel that since these aren't strong acids/bases there should be more work involved

Am I doing this right? I feel that since these aren't strong acids/bases there should be more work involved
I agree. Are you familiar with ICE tables?
The pK_{b} of methylamine is 3.36 and the pK_{b} of KCN is 3.00.