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91
Chemical Engineering Forum / MOVED: chemical composition of the CR2032 battery
« Last post by billnotgatez on November 21, 2022, 06:58:19 AM »
This topic has been merged to your other post in High School Chemistry Forum

https://www.chemicalforums.com/index.php?topic=112156.0

@barretff7
It is along the same line of questioning and we do not cross post same or like questions between forum boards
see forum rules   see link at top of page to rules
92
High School Chemistry Forum / chemical composition of the CR2032 battery
« Last post by barretff7 on November 21, 2022, 06:42:51 AM »
What is the chemical composition of the CR2032 battery?

Is it an oxidative corrosive chemical composition for metals and PCBs?

over the years this chemical composition of CR2032 changes and turns into a corrosive oxidative chemical compound that leaks and corrodes?
93
Undergraduate General Chemistry Forum / Re: Does metallic iron dissolve in water?
« Last post by Hunter2 on November 20, 2022, 11:41:07 AM »
The soloubility is poor, it will coat the iron and the reaction will stop.
94
Undergraduate General Chemistry Forum / Re: Does metallic iron dissolve in water?
« Last post by sharbeldam on November 20, 2022, 11:37:17 AM »
Its Fe(OH)2 Which is basically Fe+2 as well, why cant it keep forming that hydroxide until it vanishes?
95
Undergraduate General Chemistry Forum / Re: Does metallic iron dissolve in water?
« Last post by Hunter2 on November 20, 2022, 11:17:48 AM »
It will be stopped, because hydroxide is formed. Fe + 2 H2O => Fe(OH)2 +H2
96
Undergraduate General Chemistry Forum / Re: Does metallic iron dissolve in water?
« Last post by sharbeldam on November 20, 2022, 11:13:48 AM »
I understand, thank you both, but to sum it up fully, i dont want to talk about the reaction with oxygen at all. You say metallic iron needs to react with acids to form Fe+2. but my question is why not just put it in water, since it is spontaneous, it should " DISSOLVE " into Fe+2 which is in that supplement too, is it because the reaction is very very slow in water relative to the reaction in acid?
97
Undergraduate General Chemistry Forum / Re: Does metallic iron dissolve in water?
« Last post by Aldebaran on November 20, 2022, 10:30:03 AM »
Regarding your comment about the standard electrode potential being negative and therefore not spontaneous: notice that the equilibrium is written as a reduction of the 2+ ion . If instead you start with metallic iron the value for the oxidation reaction would be reversed thus + 0.44 v. This supports our every day experience that metallic iron in the presence of oxygen and water rusts (oxidises) . Iron oxides can react with acids and form various salts one of which is iron(II) sulfate which I believe is what is present in “spatone”.
98
Undergraduate General Chemistry Forum / Re: Does metallic iron dissolve in water?
« Last post by Hunter2 on November 20, 2022, 10:02:52 AM »
Correct, but in nature iron dont appear as a metal. So rivers and lakes with high iron content came from iron compounds  already containing iron Ions. Metallic iron is man made.
99
Undergraduate General Chemistry Forum / Re: Does metallic iron dissolve in water?
« Last post by sharbeldam on November 20, 2022, 09:57:21 AM »
I understand what you are saying, but what im asking isnt related to rust, im just talking about being dissolved, so basically the reaction you typed, it has a negative value, so it shouldnt be spontaneous, or it can happen very slow, so if we put a rod of iron in the water, it will become Fe+2 very slowly?
100
Undergraduate General Chemistry Forum / Re: Does metallic iron dissolve in water?
« Last post by Hunter2 on November 20, 2022, 08:55:14 AM »
Do you know rusting of iron. Iron ist also an inoble metal, Fe => Fe2+ + 2 e-, E0 = -0,44 V. Together with oxygen it will be dissolved in water. But it takes some time.
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