Dear Hanbo, thanks for sharing this interesting technical question with the RG community. The perosvkite CsSnBr3 is an addition product of CsBr and SnBr2 in a molar ratio of 1:1. Thus addition of 1 mol of CsBr to 1 mol of SnBr2 yields 1 mol of CsSnBr3. The same is true for 0.8 mol or 0.8 mmol as in your case. Thus you did everything right. Combining of the specified amounts (170.248 mg (0.8 M) of CsBr and 222.814 mg (0.8 M) of SnBr2) in 1 ml of DMSO gives a 0.8 M solution of CsSnBr3.

Good luck with your experiments!

That means that in 100ml of medium you will nead 1000ng of carvacrol. If you dilute your carvacrol in DMSO at 10*1000=10.000ng/ml , and you need the DMSO at 0.1%, you will need 0.1ml of DMSO. Then, 10.000ng/ml(concentration in DMSO)*0.1ml (volume of DMSO that you use)=1000ng(amount of carvacrol that you needed).

The perosvkite CsSnBr3 is an addition product of CsBr and SnBr2 in a molar ratio of 1:1. Thus addition of 1 mol of CsBr to 1 mol of SnBr2 yields 1 mol of CsSnBr3. The same is true for 0.8 mol or 0.8 mmol as in your case. Thus you did everything right. Combining of the specified amounts(170.248 mg (0.8M) of CsBr and 222.814mg (0.8M) of SnBr2) in 1 ml of DMSO gives a 0.8 M solution of CsSnBr3.

Hello Hanbo. If I may be so subtle, you should consider that your resulting solution, obtained by dissolving almost 0.4 g of salts in 1 ml of DMSO, probably occupies a volume of more than 1 ml. Consequently, your solution does not have 0.8 M, but a little less. For exact considerations this should be taken into account. To obtain a solution with exactly 0.8 M, the weights of the two salts must be dissolved in DMSO and made up to 1 ml. This is easier to do with larger volumes and a volumetric flask.

Dear Florian,

that's a good point. It is often forgotten that for making e.g. 0.1 M or 1 M solutions you need to fill up the solution to a certain volume (100 ml or 1 l) in order to take the volume of the dissolved compounds into account (see e.g. my answer to the RG question "How much NaCl is required for 100 mM NaCl solution?").

In this case it remains to be seen if ca. 0.4 g. of precursors materials (CsBr and SnBr2) are completely soluble in such a small amount of DMSO.

Good luck with your work!