i need help..?

Question

A KMnO4(aq) solution is to be standardized against As2O3(s) . A 0.1078g sample of As2O3 requires 22.15 ml of the KMnO4 (aq) for its titration . what is the molarity of the KMnO4(aq)?

5 AS2O3 + 4 MnO4 + 9 H2O + 12H ----> 10 H3AsO4 + 4 Mn

Answer 1

Suggestiojns:

Always write in the charges on your ions, or the redox equations don't make sense. When posting QQ, say what kind of problem it is so peoplewill knowif they can/want to answer.

Bookkeeping.and unit conversion:

0.1078 g As2O3 x (1 mol As2O3)/(f.w. As2O3 in g) [you are nowin mol As2O3. To balance amounts of different substances, you always need moles]

x (4mol MnO4-)/(5 mol As2O3) [from balanced equation; this is the chemical heart of the calculation. Check that units cancel correctly and you are now in mol MnO4-]

= moles MnO4-

And then just use conc x vol = moles tofind conc MnO4-

Answer 2

Concentrated sulfuric acid reacts with KMnO4 to give Mn2O7, which can be explosive.Similarly concentrated hydrochloric acid gives chlorine. The Mn-containing products from redox reactions depend on the pH.
Acidic solutions of permanganate are reduced to the faintly pink manganese(II) sulfate ([Mn(H2O)6]2+).
In neutral solution, permanganate is only reduced by 3e- to give MnO2, wherein Mn is in a +4 oxidation state. This is the material that stains one's skin when handling KMnO4. KMnO4 spontaneously reduced in an alkaline solution to green-coloured K2MnO4, wherein manganese is in the +6 oxidation state.

A curious reaction is produced by adding concentrated sulfuric acid to potassium permanganate. Although no reaction may be apparent, the vapor over the mixture will ignite paper impregnated with alcohol. Potassium permanganate and sulfuric acid react to produce some ozone, which has a high oxidising power and rapidly oxidises the alcohol, causing it to combust. As a similar reaction produces explosive Mn2O7, this should only be attempted with great care. An approximate equation for the ozone formation is shown below.

At room temperature
6 KMnO4(aq) + 9 H2SO4(aq) → 6 MnSO4(aq) + 3 K2SO4(aq) + 9 H2O(l) + 5 O3(g)

Dont think this has anything to do with your question but it sounds good to me

Answer 3

- Firstly, find the mole of As2O3 by dividing 0.1078 by the molecular weight of As2O3.
- Then find the mole of MnO4 by the ratio As2O3 : MnO4 = 5:4
--> molarity of MnO4 = mole/volumn.

Hope this help.

Answer 4

I am so glad that I'm not in school anymore.

Answer 5

What grade are you in ?
lol.

Answer 6

what the helllll!!!!!!!!!!!!! hope you have fun with that!