[pharmd99]

I'm trying to copy a solution of strontium nitrate. I sent the solution to spectrum labs and was told it had 15.8g/L of strontium

They did not test for strontium nitrate, but elemental strontium.

How do I reverse this to a strontium nitrate solution?  I have strontium nitrate powder.

Here's my thought process:

How many grams of Strontium nitrate - Sr(NO3)2 would have 15.8grams of Strontium?

Atomic mass of Strontium 87.62 g/mol
Atomic Mass of Sr(NO3)2 or strontium nitrate is 211.678 g/mol
87.62 / 211.678 * 15.8 grams = 38.17 grams

Assuming my calculations are correct: Strontium Nitrate solution of 38.17g/L would have 15.8g/L of elemental Strontium.

It's been a long time since i've had inorganic chemistry . Please check my calculations and tell me if i'm correct.

thanks,
Dave

[Borek]

87.62 / 211.678 * 15.8 grams = 38.17 grams

Looks OK. I got 211.63 for molar mass of the nitrate, so 38.16 g of the nitrate itself, but its irrelevant. I doubt your nitrate is pure and dry enough for 0.01 g to have any significant difference.