Looking for learning,

[adam mizer]

I know youtube is not the bast place for learn video's but I thought this was pretty nice video.
Sreetips : So2 precipitation.

 

[goldshark]

Hi,
I filtered the solution to 2 part:
Part 1 is the brown precipitate: I put to AR and Test Stannous give very black colour
Part 2 is the remain solution in liquid: I test Stannous also give black colour but less than Part 1
So I start solve 2 part as:
Part 1: I add HCL and water and boild to kill HNO3 , then add SMB but precipitate still not hard, i attach picture, please advise me
Part 2: U add HCL and boil to a thick syrupy consistence.
please give me your opinions

Have you tried Sulfamic acid to kill the excess Nitric? I am assuming you are using distilled water.