The salt formed when aluminium reacts with potassium hydroxide, during preparation of hydrogen from alkalis ?
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hey here is ur answer .
Aluminum’s protective oxide layer has a number of weaknesses. One of which is that it is not protective against strong acids or strong alkali.
There are perhaps at least a couple of reasons why this is so;
1. The oxide, as such, is actually a mix of oxide, and (partially hydrated) aluminum hydroxide. Depending on conditions and when and where this oxide/hydroxide layer is formed, its resistance to acids and alkalis is a function of its density, perhaps as well as any reserve of protective chemicals trapped in the oxide/hydroxide. (Note-Strong acids or/alkalis .. WILL immediately overwhelm all reserve erosion or corrosion inhibitors trapped in the protective layer.)
2. Acids can attack the oxide, so it is a good idea to “seal” and maybe even add protective primer and paint over the seal. Weak acids (and weak alkalis) will slowly erode their way thru, but you dont need your aluminum door to last forever. It lasts longer depending on the environment it’s exposed to.
3. Strong acids barely notice the oxide because “amphoteric aluminum hydroxide” is so soluble in acids.. If the protective layer’s hydroxide content is leached away, the full integrity of the protective layer is damaged. It is now full of leaky holes in a matter of seconds. And bare aluminum metal is also quite soluble in aqueous acid, whoseb temperature is rising fast due to dissolution entropy (solution enthalpy). Bare aluminum metal is quite soluble in hot aqueous acid.. and so you fairly quickly get a hotter and hotter runaway dissolution layer reaction.
4. Alkalis can also attack the hydroxide very easily. And for similar micro chemical reasons
hope is helpful ☺
Aluminum’s protective oxide layer has a number of weaknesses. One of which is that it is not protective against strong acids or strong alkali.
There are perhaps at least a couple of reasons why this is so;
1. The oxide, as such, is actually a mix of oxide, and (partially hydrated) aluminum hydroxide. Depending on conditions and when and where this oxide/hydroxide layer is formed, its resistance to acids and alkalis is a function of its density, perhaps as well as any reserve of protective chemicals trapped in the oxide/hydroxide. (Note-Strong acids or/alkalis .. WILL immediately overwhelm all reserve erosion or corrosion inhibitors trapped in the protective layer.)
2. Acids can attack the oxide, so it is a good idea to “seal” and maybe even add protective primer and paint over the seal. Weak acids (and weak alkalis) will slowly erode their way thru, but you dont need your aluminum door to last forever. It lasts longer depending on the environment it’s exposed to.
3. Strong acids barely notice the oxide because “amphoteric aluminum hydroxide” is so soluble in acids.. If the protective layer’s hydroxide content is leached away, the full integrity of the protective layer is damaged. It is now full of leaky holes in a matter of seconds. And bare aluminum metal is also quite soluble in aqueous acid, whoseb temperature is rising fast due to dissolution entropy (solution enthalpy). Bare aluminum metal is quite soluble in hot aqueous acid.. and so you fairly quickly get a hotter and hotter runaway dissolution layer reaction.
4. Alkalis can also attack the hydroxide very easily. And for similar micro chemical reasons
hope is helpful ☺
arthi27:
Thankq so much
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Answer:
potassium meta aluminate
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