[alt-photo] Re: Dilution calculation

[Jon Reid]

Thanks everyone!

Jon

On 02/03/2012, at 7:54 PM, Loris Medici <mail at loris.medici.name> wrote:

> Jon,
>
> You can use small syringes for measuring small amnts. of solution.
> (There are 1ml, 2ml, 5ml, 10ml, 50ml ... syringes.)
>
> I do my calculations based on the dry content of the source solution...
>
> Example:
> You need 10ml of 2.5% solution, but you have a 20% solution
> 1. 10ml x 2.5% (0.025) = 0.25g (This is the dry content of your target
> solution...)
> 2. (x)ml x 20% (0.2) = 0.25g. Therefore (x) = 0.25g / 20% (0.2) =
> 1.25ml (This is the volume of your source solution which contains the
> exact dry amnt. needed for the target solution...)
> 3. Conclusion: You need 1.25ml 20% solution + 8.75ml (10ml final
> volume - 1.25ml source solution) distilled water to mix 10ml 2.5%
> solution...
>
> Hope this helps!
>
> Regards,
> Loris.
>
>
> 2 Mart 2012 09:52 tarihinde Jon Reid <jon at sharperstill.com> yazdı:
>> Dear list,
>> Would someone be kind enough to either explain how to work out
>> dilution calculations or how to use one of the online calculators?
>>
>> Several online dilution calculators have units and symbols I don't understand.
>>
>> I have 20% Na2 and I'd like to create some 2.5% and 5% solutions.
>>
>> Further, what's a good method for accurately measuring small amounts
>> of solution? Do I need a pipette?
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