Eli5: what is exactly is molarity.

Question

if you have 2 solutions for example
50ml of 0.5M of a solution (A)
and 0.25M of 100ml of a solution (B)
Would the new volume be 150ml or 0.150L
And would I have to change the molarity of solutions A and B

In: 2

Answer 1

Yes, both substances would be diluted to a lower concentration when combined.

B would now be 0.025 moles in 150ml and A would also be 0.025 moles in 150ml. (.1666 M for both components)