[utahevo]

20.0 mL of 0.100 M chemical A is mixed with 40.0 mL of 0.500 M chemical B. Calculate the final molarity concentration of chemical A and the final molarity concentation of chemical B in the mixture.

for whatever reason (just burned out i think) my brain cant seem to make this make sense. does this give me everything needed to solve? Can someone help me with solving?

[Borek]

Start with the reaction equation. Which is a limiting reactant? Or is it an equilibrium process?

[Arkcon]

If A and B don't react, then you're asked how to make a solution from two solutions.  Consider:  if you had just A, and added some water, you'd expect less conc., right?  But how much?  Does that change because there's some B in your diluent?