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    suggest why a mixture of nitrous acif and sodium nitrate can act as a buffer solution whereas a solution of sodium nitrate on its own does not?

    help! this came up in the jan04 and im worried it will come again! please help! i got an exam later
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    (Original post by kriztinae)
    suggest why a mixture of nitrous acif and sodium nitrate can act as a buffer solution whereas a solution of sodium nitrate on its own does not?

    help! this came up in the jan04 and im worried it will come again! please help! i got an exam later
    a buffer solution should contain both the weak acid/base and its salt in a reasonable amount such that it resists change in pH when small amounts of acids or bases are added. If it only contains sodium nitrate, when base is added, nothing gives out H+ ions to reduce the amount of OH-. So pH will change.
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    (Original post by keisiuho)
    a buffer solution should contain both the weak acid/base and its salt in a reasonable amount such that it resists change in pH when small amounts of acids or bases are added. If it only contains sodium nitrate, when base is added, nothing gives out H+ ions to reduce the amount of OH-. So pH will change.
    thank you so much! i,ll give you rep later! your a star!!
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    Good luck everyone sitting Edexecel Chem!

    Im properly scared but hopefully all will be good!
    The Unit for in january was nasty so maybe they will be a bit nicer to us!
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    yep
    the CHM4 & 5 papers are quite difficult but the grade boundaries are not low for Jun 03
    worrying....
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    oooooh-- im sccared- its this afternoon right?

    PS- Happy 18th to me!! wooooooooooooop
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    (Original post by misty)
    oooooh-- im sccared- its this afternoon right?

    PS- Happy 18th to me!! wooooooooooooop
    lovely! birthday on your 18th! better be rewarding!
    good luck everyone! we will be fine! i hope !
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    hope it all goes well! i have Unit 5 this afternoon!

    GOOD LUCK EVERYONE!
 
 
 

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