How do you prepare 500 ml of a 50 ppm standard solution?

Answer 1

If I told you to prepare 50% solution how would you do it?

50% (w/v) means 50 g of solute per 100 ml of solution, but also 50 parts per hundred.

ppm is parts per million so you need
50 g for 10^6 ml
x g for 500 ml
Thus x=50*500*10^-6 = 25 *10^-3 g or 25 mg

If it were a liquid and it was (v/v) you would need 25 microliters

Since you want to prepare a standard solution and these amounts are very small you should prepare a more concentrated solution and dilute; otherwise the error will be huge.

Answer 2

Firstly, prepare a 100 ppm standard solution in a 500-ml volumetric flask with the required solvent and then take exactly 250-ml from the prepared solution into a new 500-ml volumetric flask and dilute it with the same solvent upto the mark of the volumetric flask. Presto, you have now a 50 ppm standard solution.

Answer 3

To prepare 500mL of a 50ppm standard solution, get a 500mL volumetric flask. Pour the 50ppm standard solution until the meniscus sits on the 500mL line. lol... you're missing some information, such as what is the final concentration? Anyway, the formula you want to us is (initial concentration)(initial volume) = (final concentration)(final volume) plug and play!

Answer 4

25000ppm / 500ml = 50ppm/ml