How do you calculate this?

Question

Given 5ml and 10ml pipets and 50 ml and 100-ml volumetric flasks, what are the possible concentrations you could make in one dilution of the NaCl solution above? (given 0.6593g of NaCl in a 100ml volumetric flask (0.1M)) What are the max and min concentrations that you could make by doing a second dilution?

Answer 1

The initial solution has 0.01 mol diluted in 100 ml.

The minimum concentration after a second dilution you get by taking 5 ml of the solution and dilute it in 95 ml of water.
You then have 5% of 0.01 mol in 100 ml or 0.005 M.

The maximum concentration after a second dilution you get by taking 10 ml of the solution and dilute it in 40 ml of water.
You then have 10% of 0.01 mol in 50 ml or 0.02 M.

In the last case you could also do nothing, and keep you 0.1 M solution.

Answer 2

I can't. Why ask me such a hard question? Are you attempting to show my ignorance? You do not have to, I do that extremely well; thank you anyway. SMILE