Chemical Forums

Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: AhmedEzatAlzawalaty on March 14, 2007, 04:59:41 PM

Title: Blank experiment
Post by: AhmedEzatAlzawalaty on March 14, 2007, 04:59:41 PM
what is blank experiment and how we do it ,when and why?
Title: Re: Blank experiment
Post by: AhmedEzatAlzawalaty on March 17, 2007, 04:31:26 PM
where is every body?
Title: Re: Blank experiment
Post by: billnotgatez on March 18, 2007, 04:19:15 AM
I am not sure of your terminology and this is not my area of expertise.

I assume the system you are using to measure something creates its own readings without anything in it to be measured. You take these reading when the situation is blank to subtract / remove from your final results when you measure the test item.

By the way, at the time of this posting this thread had been read 23 times and surely some of those readers were moderators or admins. This usually means that the question was too broad or confusing.

Title: Re: Blank experiment
Post by: AhmedEzatAlzawalaty on March 18, 2007, 10:52:38 AM
i mean as in indirect titration of an analyate we make blank experiment what does this mean?could u suppose some example?
Title: Re: Blank experiment
Post by: ARGOS++ on March 22, 2007, 06:27:52 AM
Dear ahmedezat,

(First:  Thank you for your Mail, - It makes me proud!)

I just realised, from both your questions, that you need a more
general answer to this/Your problem, and that means a more
philosophic one,  — “A Picture”:

 A.)  ALL POSSIBLE experiments/measurements are Questions to
       Mother Nature !!!
 B.)  Mother Nature holds the only contract, that HER answer is
       ALL THE TIME, as COMPLETE as POSSIBLE for
       the selected/designed (YOUR settings/design !!) of the
       experimental environment !!
 C.)  That means nothing else, as that you have ALL the TIME to
       use the following formula for your experiments/measurements (E/M)
       and your got Signal (S):
                        ∞
       S(E/M)   =   ∑ Sj   =  S1 + S2 + Si + S4 + S5 + ……..          (Eq. 1)
                        j 
       (Have You seen:     Si = Signal of interest !!!)
 D.)  Quintessence:  You HAVE TO EXTRACT your Si,  ? of course, only
       if you prefer to be reliable:
       Si   =   S(E/M) ─  (S1 + S2 +  0.0000  + S4 + S5 + ……..)    (Eq. 2)
 E.)  Now you may realise, that the (Residual-)Term in Eqiation 2, after
       the Minus-Sign, is nothing else, as the Signal of your selected/designed
       Environment, called:
          The Blank   OR   Reference(in spectroscopy)  OR   ……   =  Senv.

       So the (Residual-)Term is also the Recipe, “How to do it”,  — 
       Make the identical experiment “with the Concentration”:   
                     Conci = 0.0000 !!!
 
Have You realized, to make “A Picture” of  “Everything plus one”, if possible THE correct, is ALL TIMES the most important to do,  —
But especially for to have success!!

Sorry, if it finally empowered a little too moralistic for You, But specially for the Others.

Good Luck!
                         ARGOS++

Title: Re: Blank experiment
Post by: Borek on March 22, 2007, 06:58:05 AM
Please don't crosspost. Answering once in one thread is enough.
Title: Re: Blank experiment
Post by: AhmedEzatAlzawalaty on March 22, 2007, 02:55:10 PM
thanx ARGOS for the philosophic answer , you deserve more than such mail,