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    Hi there! This may sound like a stupid question but it's something I've never been taught. I need to know this for Physics.

    When given a concentration in the format 0.5M (0.5 is just an example), what does it actually mean? It's 0.5, but out of what? A litre? A decimetre cubed? Is it in moles?

    Thanks!
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    (Original post by JustJusty)
    Hi there! This may sound like a stupid question but it's something I've never been taught. I need to know this for Physics.

    When given a concentration in the format 0.5M (0.5 is just an example), what does it actually mean? It's 0.5, but out of what? A litre? A decimetre cubed? Is it in moles?

    Thanks!
    It's just a shorthand way of writing mol dm-3 , known as the molar ratio between the moles of solute per dm3
    So 0.5M = 0.5 mol dm-3

    I also remember wondering what it was and just being puzzled by it
 
 
 
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