[chess_player]

I need some Manganese Dioxide for a lab i will be performing and i have a sample of MnO2 + ZnCl and another sample of MnO2 + NH4Cl. How do i seperate the MnO2 from these? thanks in advance!

[Borek]

You have to show your attempts at solving the question to receive help. This is a forum policy.

What separation methods do you know?

[Arkcon]

Also, what is your application?  Is it possible you don't need to purify the manganese dioxide?

[chess_player]

i am putting it in some hydrogen peroxide to collect a sample of O2. as far as separation methods go i was going to try and filter them but i was unsure if they would both be left in the left so it didnt seem to probable.

[Arkcon]

For experimental quantities of oxygen gas from household hydrogen peroxide, I just needed a catalytic amount of manganese dioxide scraped out of a dry cell battery.  Yes it contains carbon and ammonium chloride, but they don't interfere with manganese dioxide generating oxygen from hydrogen peroxide.

[chess_player]

yep thats exactly what i am doing. but can i purify the MnO2?

[Arkcon]

OK.  Since you seem hell bent on ignoring what I say, let's all follow the Forum Rules{click}, and have you show us your attempt.  You know the components, let's see your attempt at separating them based on physical and chemical properties you can look up.  Often, beginning students are given a mixture of sand, salt and sugar to separate from one another.  Your problem is not too different.

[chess_player]

Let me start by saying that I am very sorry about my previous posts as they broke several rules.
     I knew that NH₄Cl is a chloride compound so it is soluble in water. I was under the assumption that MnO₂ was soluble in water but I discovered that it is not.
    So if I took a sample of the H₂O + MnO₂ + NH₄Cl and put it through a filter, the NH₄Cl would dissolve in the water (since it is a chlorine compound) and the MnO₂ would precipitate out. This is correct, is it not?
   

[Zyklonb]

Yes it is correct.
BTW, not all chlorine compounds are water soluble, silver chloride for example has one of the lowest solubilities of all silver compounds: 1.923×10^-4 grams/100 mL.

[Archy12345]

If we are on the topic of purity (and Arkcon knows I love purity), then it is worth noting that there is a decent amount of iron contamination in the manganese (IV) oxide found in batteries.

This iron will not inhibit your ability to produce oxygen, but it's yet another interesting challenge to get the iron out.

[chess_player]

yes i had noticed that even after 10-15 hours of drying, then MnO₂ wasnt in a powdered state. It was more of a jellyish black substance and not a powder like the other i saw.

[Babcock_Hall]

Your formula for zinc chloride is incorrect.