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    My specification says,

    "Salts of transition metals, as with salts of some other metals, can be made by reacting their oxides or hydroxides with acids. Transition metal oxides and hydroxides do not dissolve in water and are called bases. To produce a solution of soluble transition metal salt, the metal oxide/hydroxide is added to an acid until no more will react. The excess metal oxide/hydroxide can then be filtered off."

    What does that mean? It says that transition metal oxides/hydroxides don't dissolve in water, but then in the next sentence it says it does..?
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    Oh I know, this is kind of a complicated concept to understand... Our teacher only explained this to us some time ago. So basically, they are bases, so they're insoluble. But you can make them react, by adding it to the acid, as it says. I think the acid is supposed to be in excess... It's really very strange but try wikipedia or google, "transition metals reaction" or "bases reaction", it might help .
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    Oxides and hydroxides don't dissolve, but salts like chlorides and sulphates do, these are the products when you react a base with an acid..
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    (Original post by R.J.A)
    Oxides and hydroxides don't dissolve, but salts like chlorides and sulphates do, these are the products when you react a base with an acid..
    Ah, I think I see... so what's the difference between a base and an alkali?
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    A base is a metal oxide. An alkali is formed when a base is in solution.
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    According to BBC Bitesize:
    An alkali is a soluble base. So sodium hydroxide, which soluble, is considered an alkali and a base. Magnesium oxide, which is insoluble, is considered to be a base but not an alkali. In other word it is the potential that a substance has of making an alkaline solution that make it an alkali.
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    But just to clear up:

    Base = insoluble substance that neutralises acid

    Alkali = soluble substance that neutralises acid
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    Ah I see. Thank you very much
 
 
 

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