1) To prepare a 200 mL of aqueous stock solution X, you transferred 50 mL of a known concentration solution into a 200 mL volumetric flask. If you realize that the volumetric flask was contaminated with water droplets after you cleanly transferred the known concentration solution. The 200 mL solution X will have a

_________(higher, lower or same) concentration than(as) you originally calculated.

2) You transfer a 2M stock solution of Y into a container using a slightly wet pipet containing water drops. The concentration of the transferred solution Y has a

___________(lower, higher, or same) concentration than(as) 2M

why would water dropplets matter, you are filling it up to 200ml with water added.

If you add water to the 2M solution, is is diluted already before you mix.

1) So since we are just filling it up to 200ml the volume does not change so it has the SAME concentration?

2) so if we add more water which increases the volume making it (mol / L <-- increased) resulting in a LOWER concentration?

right on both.

For the second one you can also do it another way. Filling a WET pipet with the solution means you have LESS of the 2 M solution and M = mols/L; therefore, we have fewer mols and that means smaller M.(lower concn).

For both questions, the presence of water droplets in the volumetric flask or pipet will dilute the concentration of the solution.

1) In the first scenario, you transferred 50 mL of a known concentration solution into a 200 mL volumetric flask, but the flask was contaminated with water droplets. Since the water droplets add additional volume without contributing to the solute concentration, the resulting solution will have a lower concentration than you originally calculated. Therefore, the concentration of the 200 mL solution X will be lower than your original calculation.

2) In the second scenario, you transfer a 2M stock solution of Y into a container using a slightly wet pipet containing water drops. Similar to the previous situation, the presence of water droplets will dilute the concentration of the transferred solution. As a result, the concentration of the transferred solution Y will be lower than the original 2M concentration.