[himinameisgreg]

Hi im sorry i dont know if this is the correct forum to ask this question in but here it is:
I need to calculate the riboflavin content for a solution. It was made from 1 vitamin tablet dissolved in 20ml of water. Then the solution was made up to 100ml with neutral buffer. Then a 1:50 dilution was made with the solution. The concentration of riboflavin in the 1:50 solution was 86 μg/L. I need to know the riboflavin content in the tablet, in mg. Could anyone be kind enough to help me with this please. Thank you.

[Borek]

What do you know about dilutions?

[himinameisgreg]

im sure that i have to multiply the 86 by 50 but after that im stuck. Im sorry, i tried asking my friends but they are faring no better. I know it sounds like easy question but i am not feeling good about it  .

[Borek]

What is the basic principle behind dilutions?

What is a common thing for both solution before dilution and solution after dilution?

[himinameisgreg]

if i did this would it be correct?

86x50=4300 ug/L

since that was made from the 100ml solution then it would be 4300/10 which is 430 ug.

[Borek]

No idea if it wasn't just a lucky guess, but yes, looks like 430 μg is a correct answer.

[himinameisgreg]

thank you very much sire!