Solve Redox Titration Problem w/ NaNO2 & KMnO4 - Help Needed!

[Kail]

I have many problesm with this question. Can somone help me please?

In a titration of patasium permanganate soloution with acidified sodium nitrate solution

MnO4- + BO2- H+ -----> Mn+2 + NO3- +H2O

45 ml of 0.05M of KMnO4 reacts complitely with 20.0 mL of NaNO2 solution.

Calculate the molat concentration of sodium nitrate.

Please give me a hand with this. I relly need help to pass my chimetry curse.

 

[Borek]

You must start with balanced equation. Once it is balanced calculate number of moles permanganate used and stoichiometric amount of sodium nitrate. Latter divided by 0.02L will give you concentration.

 

[Kail]

Sorry but I kinda dontt understand how to get the stoichiometric amount of sodium nitrate. And what do I have to divide by 0.02L. Sorry it's just I kinda not that good at chemestry.

 

[Borek]

See stoichiometric calculations lecture to find out how to calculate amount of nitrate. Go for moles, not for mass. Number of moles divided by volume is just a molar concentration which you are asked for.