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  • Dilution

    I am stuck at how to work out how I make 500mls of a stock solution. I had a question about making initially 500ml of sodium chloride 0.9% for 500ml. I think I am correct in thinking that I needed 4.5gms.
    From this, I need to make another 500ml of 0.45%.
    Do I need to multiply 0.45 by 500? I think I need to divide this answer by another figure but I can't remember which one! As you guys can see, maths is a sore point for me.

  • #2
    What is exactly the question you were asked? Word for word .... maybe you'll get some help when the question is read whole and understood......

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    • #3
      I have to prepare a solution of sodium chloride 0.9% for 500mls and from this, I have to then prepare 0.45% sodium chloride from the already made preparation. I have a rough idea of how to arrive at the amount of sodium chloride I need to make the first preparation but after that I am a bit stuck

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      • #4
        All im saying is 0.9 is a multiple of 0.45. Hope this helps

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        • #5
          Question asked before. Use search box to search forum.
          johnep

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