[marc]

I Know that the anwswer to this is right in front of me but am having a mental block right now.

I start with 50mL of 1M Nitric acid and use it to leach a soil sample for two hours at near boiling. When I am finished there is 40mL of solution left. What is the new concentration? Assuming that none of the HNO3 evaporated just H20.

[Borek]

C=n/V, what have changed, what have not?

Note, that some acid could have been consumed by the process.