Chemical Forums
Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: denisa174 on April 23, 2021, 02:28:11 AM
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Hello,
I have got a silicon standard solution for AAS is in 2% NaOH. How should I prepare the 2% NaOH? Does that easily mean 2 g in 100 ml in measuring flask? There is not any indication of v/v or w/w or w/v
Thank you very much
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I think it must not very accurate 2 g in 100 ml should be fine.
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I have got a silicon standard solution for AAS
So you are saying you have the ready solution? If so, why do you ask how it should be prepared? Somehow I think you didn't wrote what you wanted to, can you elaborate?
a silicon standard solution for AAS is in 2% NaOH. How should I prepare the 2% NaOH? There is not any indication of v/v or w/w or w/v
Sounds like 2% NaOH is just a supporting solution, so its concentration doesn't have to to be too exact, even few percent error won't matter. Difference between 2% w/w and w/v are completely negligible in such case.
Does that easily mean 2 g in 100 ml in measuring flask?
Good analytical practice is to not use measuring flasks for preparation of such solutions - NaOH is corrosive to the glass. I would prepare the solution of NaOH in a beaker.
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So you are saying you have the ready solution? If so, why do you ask how it should be prepared? Somehow I think you didn't wrote what you wanted to, can you elaborate?
I have got the standard, but for AAS analysis I need to have the same solution for calibration and for dilution of samples.
Sounds like 2% NaOH is just a supporting solution, so its concentration doesn't have to to be too exact, even few percent error won't matter. Difference between 2% w/w and w/v are completely negligible in such case.
Ok, thanks
NaOH is corrosive to the glass. I would prepare the solution of NaOH in a beaker.
That is good point, thanks