Ok, I am definitely victim to the use it or lose it crowd when it comes to math. This is a simple problem but I'm lacking the confidence my logic with it.

so, I want to make a 3L solution.

To make a 1L solution, I add 100mL of this 10X reagent with 900mL of water.

I must then add 700g of a powder to this solution. In the end, the final volume comes out to be 1400mL.

For the sake of my own curiosity, how do I go about solving this?

Here's what I've reasoned...

700g for 1400mL

to make 3000mL, 3000/1400 = 2.14

700g x 2.14 = 1498g

100 x 2.14 = 214mL of 10x soln

900 x 2.14 = 1926mL of water

~~~~ with the outrageous amount of powder, I should get 3L.

Am I right or wrong? Please help me out with this. thanks