Bases

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Is this correct?

A base is a substance which will neutralise an acid, but only some bases will dissolve in water, the ones which do are called alkalis. A base will react with acids to absorb hydrogen ions.

Is there anything more i can add?

Thankyou :)

Posted: 17-12-12 16:54 by :) PurpleJaguar (: - Team GR

Bases

            1) Bases react with and neutralise acids.

            2) Metal oxides and metal hydroxides are bases

            3) ALKALIS are soluble bases

4) Alkalis produce OH- ions in water.

Posted: 17-12-12 17:07 by bec

Okay thankyou :)

Posted: 17-12-12 17:22 by :) PurpleJaguar (: - Team GR

examples of bases are;

metal hydroxides

metal oxides

matal carbonates

metal hydrogencarbonates

a base is a substance with a pH greater than 7. an alkali is a base and it dissolves in water( it forms OH- in water)

neutralisation between acids and bases are

 acid+base----> salt+water:)

<3

Posted: 27-12-12 12:43 by elllieeeeeeeee

Thanks, il add to my notes ;)

Posted: 27-12-12 12:49 by :) PurpleJaguar (: - Team GR

its okay:*

do you know anything about half equations that you could help me with?:))

thankyou!

<3

Posted: 27-12-12 12:51 by elllieeeeeeeee

I can give you an example;

For lead bromide:

At the neg electrode this happens;  Pb2+ + 2electrons---> Pb
At the pos electrode this happens;  2Br-  ----->  Br2  +  2electrons

With almost every equation like this, at the negative electrode you will always be adding 2 electrons. We also have to balance the equation at the positive electrode.

Reduction happens at the negative electrode and oxidation happens at the positive.

Hope that helps, if you need any more help just ask :) <3 

Posted: 27-12-12 12:56 by :) PurpleJaguar (: - Team GR

thankyou!!!! how do you know to but Pb2+ + 2electrons---> Pb

and  2Br-  ----->  Br2  +  2electrons?! like aaah okay i kinda get it so its always 2 unless they state?! 

<3

Posted: 27-12-12 13:02 by elllieeeeeeeee

Pb2+ means that Pb needs to lose two electrons, therefore you put '+ 2 electrons'.

And Br2 means there are two Br atoms present in the equation, and the Br2- means Br needs to gain 1 electron, so you put '+ 2electrons' and you balance it by putting 2Br. 

Does that make sense?

And if you want to do the half equation for molten aluminium oxide, you have to add different amounts of electrons at the neg electrode. This example is much harder.

<3

Posted: 27-12-12 13:12 by :) PurpleJaguar (: - Team GR

aaaah that makes sense thankyou!!!!!! you're really good at explainging thankyou!

<3

Posted: 27-12-12 13:22 by elllieeeeeeeee

Aw its okay, im glad i could help!

If you need anymore help just ask :)

<3<3

Posted: 27-12-12 13:37 by :) PurpleJaguar (: - Team GR

i will do, thankyouuu:')

<3

Posted: 27-12-12 13:41 by elllieeeeeeeee

:) <3

Posted: 27-12-12 13:44 by :) PurpleJaguar (: - Team GR