CHEMISTRY PLEASE HELP!!!!!!! Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal viole...

Question

Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal violet with 2.0 mL of 0.100 M NaOH and 4.0 mL of distilled water. 

 

I am so so so lost and confused. I have no idea where to start solving this problem, and would really love if someone could explain (in terms for a struggling student) how to solve this?! Thank you for your help, I am trying my best but questions like this are making me nervous and stressed out!

Answer 1

Basically you are taking one solution of a known concentration and diluting it with 'water'

 

If we have the original concentration of the solution and the volume of it added we know that the number of constituents in the solution is equal to the concentration multipled by the volume.

We als know that this number divided by the final volume of the solution is equal to the new concentration of the constituents in the solution.

 

We state this as C1*V1= C2*V2

 

or C2 = C1 *(V1/V2)

 

V1 is 4 mL

V2 = V1 plus 2 mL plus 4 mL  the dye solution(V1) plus the acid plus the water

 

C2 = C1 *(4/10) = 4 x 10 ^(-5) M 

 

all concentration changing relationships have as basis the nuimber of particles... mass of the materials in the process does not change in the process.