Order of operations within solution?

[Ellias]

Hey everyone! I wanted to check a concept with everyone. Let me give an example.

Conditions:
1. Lets say in a HNO3 solution, we have dissolved pmgs and copper.

2. We have excess HNO3

Question:

If decide to place copper to cement the PGMs - what happens first, copper dissolves into HNO3 OR does pmg cement first then redissolve?

The same question but does solution react differently if we put Iron in?

 

[Yggdrasil]

Hey everyone! I wanted to check a concept with everyone. Let me give an example.

Conditions:
1. Lets say in a HNO3 solution, we have dissolved pmgs and copper.

2. We have excess HNO3

Question:

If decide to place copper to cement the pmgs - what happens first, copper dissolves into HNO3 OR does pmg cement first then redissolve?

The same question but does solution react differently if we put Iron in?

One thing, it is PGM.
Next, yes as the Copper is dissolved the less reactive metals cement out.
Iron will cement Copper as well.
Simply spoken.
Read the cement thread.

Edit to add text.

 

[Martijn]

Hey everyone! I wanted to check a concept with everyone. Let me give an example.

Conditions:
1. Lets say in a HNO3 solution, we have dissolved pmgs and copper.

2. We have excess HNO3

Question:

If decide to place copper to cement the pmgs - what happens first, copper dissolves into HNO3 OR does pmg cement first then redissolve?

The same question but does solution react differently if we put Iron in?

You are learning and trying to make sense of all this, but please try to read the links Yggdrasil gave you and read hem again until it starts making sense. The dealing with waste thread explains a lot.

you need to understand reactivity, solubility and displacement or redox reactions.

This question was basically answered in your other thread.

 

[Ellias]

One thing, it is PGM.
Next, yes as the Copper is dissolved the less reactive metals cement out.
Iron will cement Copper as well.
Simply spoken.
Read the cement thread.

Edit to add text.

I have edited, thanks! That clears up my PGM and PMG debate haha!

Also, this question is a tad bit different. I understand that it will cement out AND dissolve in eccess Nitric Acid, my question is - what happens first?

1. Nitric acid dissolves iron/copper first
2. THEN displacement/cementing due to excess Nitric Acid

Or

1. Displacement/cementing happens first
2. Then dissolving of excess iron/copper due to excess Nitric Acid

Or

Both happen at the same time.

 

[Yggdrasil]

I have edited, thanks! That clears up my PGM and PMG debate haha!

Also, this question is a tad bit different. I understand that it will cement out AND dissolve in eccess Nitric Acid, my question is - what happens first?

1. Nitric acid dissolves iron/copper first
2. THEN displacement/cementing due to excess Nitric Acid

Or

1. Displacement/cementing happens first
2. Then dissolving of excess iron/copper due to excess Nitric Acid

Or

Both happen at the same time.

I do not know for sure, but I think it might be both things going on simultaneously.
Anyways, other than in theoretical chemistry that is not important for how we use it here.

There is one thing though.
For Silver and Gold it is easy, for PGMs though, one need aggressive stirring so the cementing metal do not cover the Copper and passify it.