Which compound gives a lilac colour in a flame test and does not decompose on heating?
A) Potassium Bromide
B) Potsassium Nitrate
Can anyone tell me why the answer is not B? Because I thought so that group 1 nitrates are thermally stable so that’s why I chose A. (which is wrong)
AS Chemistry Help Watch
- Thread Starter
- 18-10-2017 12:00
- 23-10-2017 03:28
Let’s imagine we know nothing about how stable these are - what *could* KBr decompose into? Compare this with KNO3, with quite a few nitrogen and oxygen atoms. You’re right that potassium nitrate doesn’t decompose easily, but, compared to potassium bromide, it’s way more likely!