volumetric analysis

2009-03-07 8:35 am

1)After transferring the solution to a volumetric flask,we need to wash the beaker and funnel with distilled water using a wash bottle and then pour the washing into the volumetric flask again.How would the result change if I use tap water instead of using distilled water ?

更新1:

I know that tap water contains many impurities while distilled water does not. So how's the concentration of the solute change? Is it decreased?I am not sure about that.

回答 (1)

John L

2009-03-07 11:39 am

✔ 最佳答案

In volumetric analysis, the molar concentration measurement of various chemical has to be accurate. Tap water contains many impurities that you don't want in your analysis. Depending on where you live, these impurities include chlorine, trihalomethanes, haloacetic acids, Arsenic, perchlorate, and lead, just to name a few. Distilled water, on the other hand, contains pure H2O. Using it will make your analysis more accurate.

2009-03-12 01:07:24 補充：
Hi mariafransisca_lim,

Sorry that I missed your follow-up question. Those impurities will remain in your flask and likely increase the molar concentration of your analysis. In science, we must always try to keep the number of variables under control to maintain objectivity in our experiment.

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