sorry, got a little distracted, that wasn't what i meant to post, it's this one:
The content of Manganese in a steel sample should be determined by spectroscopy. Mn is oxidized to permangante.
1. A stock solution (stock I) that should be 1000mg Mn per Liter is prepared. How much KMnO4 do you have to weight out for 500ml of stock I solution?
2. By dilution a stock II solution containing 100mg Mn/L is prepared. How much of stock I do you have to pipette in order to make 250ml of stock II solution?
3. The calibration curve has to be from 0 to 20 mg Mn/L. How many ml of stock II do you need for 100ml of the following standard solutions?
Std. No. 1 2 3 4
Mg/L 2,00 5,00 10,0 20,0
i dont get the first part.
its a simple calculation, i know, i just dont understand the steel, Mn to MnO oxidation, etc thing.