Need help with easy chemistry :)

[atrollappears]

And yeah I guess I'm gonna have to look for Permanganate, since nobody seems to know how to replace it with Peroxide, either, :S

No offense, but you don't really sound like you know what you're doing, and manganese is nasty stuff to be screwing with if you have such a high probability of fucking up.

 

[jammon]

No offense, but you don't really sound like you know what you're doing, and manganese is nasty stuff to be screwing with if you have such a high probability of fucking up.

'know what I'm doing' ?
its a simple question, say NO and thats it, so I can learn and 'know what im doing'
And I do know what Im gonna do: look harder for Permanganate ,since nobody seems to know how to use Peroxide as a replacement.

So fuck those who question and judge.
And Im not fucking up, you dickhead
Cheers

 

[Vader]

You're not really a people person, are you?

 

[jammon]

Man I'm tired of the same bullshit.
I just hate people makin assumptions or questioning or judging.
This is a drug forum. If he can help me, he's welcome, if not then he should just shut the - up
Reminds me of 'drugs-forum.com', which sucks penis big time, full of cocky moderators.
Thanks to those who helped me, unlike that complete downer #21 post, he can go get fact by a donkey
PS: I think I should have the right to close the thread, since I started it, so that I don't have to deal with dudes like that one, or you talking about me.

Cheers

 

[atrollappears]

This is a drug forum.

Actually, this is a harm reduction forum.

 

[Vader]

PS: I think I should have the right to close the thread, since I started it, so that I don't have to deal with dudes like that one, or you talking about me.

See, this is what I'm talking about. If you asked nicely, said "please, mods, could you close this thread?", they'd most likely be happy to oblige. The unwarranted sense of entitlement isn't endearing, and is unlikely to make the mods want to help you. Best of luck with everything, I just think you stand to gain if you think a little about how to get what you want out of people. Vinegar and honey and all that.

 

[Hammilton]

Wow, no one has even truly been a dick to this guy and he's acting all insulted? What a child. KMnO4 is readily available in America. It's kept near the salt. For real. 30% H2O2 is far harder to obtain in my experience.

Let's start a countdown to manganism thread!

 

[SabbathViper]

TIL: Novice amateur with a chip on his shoulder demands information on drugs-forum, makes a stink when he doesn't get his answers, cops an attitude and insults everyone, gets banned, then comes to bluelight and begins doing same thing. It'll be funny when he finds himself banned from every forum with people without enough knowledge enough to help him, then he'll have nobody left to rage at but himself.

 

[Deleted member 170540]

Actually, the exact calculation goes like this.

We have the following three equations:

(1) [SO₄^2-]+[HSO₄^-] = c_a (all sulphuric acid in solution is in the form of sulphate and hydrogen sulphate, c_a is the total acid concentration)

(2) [H⁺] = [HSO₄^-] + 2[SO₄^2-] (all hydrogen ions in solution are from the sulphuric acid)

(3) [H⁺] = k[HSO₄^-] / [SO₄^2-] (pKa of hydrogen sulphate, k = 0.01 M)

From these one can derive the quadratic equation [SO₄^2-]² + (c_a + k)[SO₄^2-] - kc_a = 0

As we know that k = 0.01 M and c_a = (50g/L) / (98.079g/mol) = 0.5098 M , the positive solution of the quadratic equation is
[SO₄^2-] = 0.00963 M and from (1) and (3) we can calculate that [HSO₄^-] = 0.5002 M and [H⁺] = 0.5194 M

So pH = -log 0.5194 = 0.28

Obviously one can make the approximation that none of the hydrogen sulfate is protolysed (only 2% of it is at this pH) and then one gets pH 0.29 .