I Have a solution A of 46 gm/mL, I have another solutionB of 65 g/ml. How can I change the conc of the first solution to 50 g/ mL using the solution b. I want to make about 100 ml

this method is called "rule of cross", since it can be depicted in this way:

46 g/ml 15 parts/volumes/

50 g/ml

65 g/ml 4 parts/volumes/

draw arrows in 65 →50→15 and 46→50→4 directions, and you will get an X cross in calculation.

The similar thing is with dilutions: to make 0,2 g/ml solution from 13,3 g/ml solution, you have to take 0,2 ml of concentrated solution and dilute it to 13,3 ml final volume,

i.e. 13,1 ml of water should be added to 0,2 ml of concentrate 13,3g/ml.

Hi Feli!

To make 50 g/ml solution, you have to take:

(50-46)= 4 parts of 65 g/ml solution, (e.g. 4 ml)

(65-50)=15 parts of 46 g/ml solution (e.g. 15 ml)

this method is called "rule of cross", since it can be depicted in this way:

46 g/ml 15 parts/volumes/

50 g/ml

65 g/ml 4 parts/volumes/

draw arrows in 65 →50→15 and 46→50→4 directions, and you will get an X cross in calculation.

The similar thing is with dilutions: to make 0,2 g/ml solution from 13,3 g/ml solution, you have to take 0,2 ml of concentrated solution and dilute it to 13,3 ml final volume,

i.e. 13,1 ml of water should be added to 0,2 ml of concentrate 13,3g/ml.

regards,

Zdislav