How to make a dilution using a stock solution? and 2009 Tube Stock

How to make a dilution using a stock solution?

How would one make a solution that reads 100mg/dL using a stock solution that reads 250mg/dL?


Stock best answer:

Answer by Doctorwho
We would need to know what volume of t\he 100 mg/dL solution that we want to prepare.

Let's use 1 L as an example. We can use the relationship M1V1 = M2V2 with the concentrations (100 mg/dL and 250 mg/dL) in place of molarities.

M1 = 250 mg/dL
V1 = unknown (what to solve for)
M2 = 100 mg/dL
V2 = 1 L

M1V1 = M2V2
V1 = (M2V2)/M1
V1 = ((100 mg/dL)*(1 L))/(250 mg/dL)
V1 = 0.4 L

So to make 1 L of 100 mg/dL solution, we would take 0.4 L of the 250 mg/dL stock solution and dilute it to 1 L with water.

Stock

2009 Tube Stock


Image by Gene Hunt
Seen leaving Euston on Wednesday 9th May, this is on the Victoria Line which is the only line on the London Underground network that's wholly deep-level.

The line uses the 2009 Tube Stock which entered service on 21st July of that year and this one is seen on a service to it's terminus at Brixton.

This is the final photo I have taken in That London for now but I shall be heading back here within a year from now!

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