Recent content by Guillermo

What I meant about speed was that once you know what speed is you don't refer to 'speed scale', you just say 'we are making 55 mph' and that's all. In the case of pH scale it seems that calling it pH scale is slightly overdoing things, as it is enough to say 'this solution has pH of 3.4', you...

So pH scale is just like saying speed scale referring to the car velocity? El stupido. G

I am asked to prepare some information on ph scale. I know what pH is, I know how to calculate it in some cases, I know it is lower than 7 for acid and higher then 7 for base - is there anything more important? G

Any solvent with dissolved substance boils higher and freezes lower then the pure one. G

In reduction H2O2 + 2H+ + 2e -> 2H2O In oxidation H2O2 +2OH- -> O2 + 2H2O + 2e G

:blushing: 1.27 G

What I get is Ka2=1/B1 and Ka1=1/B2Ka2. Ka2=5.0119*10^-5 and Ka1=6.3096*10^-2 and pH=1.1 G

Wow, I was afraid you will not check the forum today :) What are protonation constants? G

This pH calculation question is only for those interested, but I wan't to do it, but I have no idea where and how to start... What is pH of solution of 0.1M diprotic acid if loarithms of overall protonation constants are 4.3 and 5.5. What is going on? No idea how to start... Borek, are...

:cry: I missed your last post and my result was wrong :cry: G PS Check my new problem, please...

Ah, so the pH is 10.5! G

I am a moron :( We spent more than hour discussing it yesterday. OK, so Kb=1.9953*10^-5. But there is still something wrong.Ammonia is a weak base, so pH=(0.005*Kb)^0.5=3.5? This is way too low. G

Here is the problem: Given pKa=9.3 what is pH of 0.005 mol/l ammonia solution. The problem is, I don't get this pKa part. I mean, I know t means Ka=5.0119*10^-10 but ammonia is a base, not acid. G