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Chemistry AS mole calcuation question! help :( Watch

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    Hello guys,

    I am being really stupid here but i just dont know how to start this question please help!

    8. 5.30 g of anhydrous sodium carbonate was dissolved in
    water and made up to 250 cm3 in a volumetric flask. Which
    one of the following is the concentration of sodium ions in
    mol dm–3?

    A 0.05
    B 0.10
    C 0.20
    D 0.40


    thanks xx
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    (Original post by Rachjin)
    Hello guys,

    I am being really stupid here but i just dont know how to start this question please help!

    8. 5.30 g of anhydrous sodium carbonate was dissolved in
    water and made up to 250 cm3 in a volumetric flask. Which
    one of the following is the concentration of sodium ions in
    mol dm–3?

    A 0.05
    B 0.10
    C 0.20
    D 0.40


    thanks xx

    Find the number of moles of sodium carbonate using the formula:
    moles= mass/molar mass


    Then using that answer use the formula:

    Moles=volume x concentration/1000

    But rearrange it to make concentration the subject
 
 
 
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