I've missed several like this in a row now. (See attached screenshot for my work).

Combine 45.9 mL of a 0.212 M aluminum sulfate solution with 12.7 mL of a 0.646 M aluminum bromide solution. What is the final concentration of Al cations?

Question

I've missed several like this in a row now. (See attached screenshot for my work). 

Combine 45.9 mL of a 0.212 M aluminum sulfate solution with 12.7 mL of a 0.646 M aluminum bromide solution. What is the final concentration of Al cations?

anonymous · Answer

attachment

anonymous · Answer

Ah, I think I may be on to something...