Expert: Henry Boyter - 7/8/2005

Question
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Followup To
Question -
I need to know how to make 1000mL of 1M perchloric acid from concentate that only gives the MW, density, and specific gravity. Also need is the calcation so I can make other solutions. This is a work related question.
Thank you
Robert Pyle
Answer -
1M is 1 mole/liter

You want 1 liter so you need 1 mole

1 mole X molwt (grams/mole) = grams acid


density = grams / mL

grams/ density = mL needed.

Remember always add acid to water until dilute, so take 500 mL water, add the acid, and dilute with water to 1000 mL.  USE THE FUMEHOOD!

If this calculation is new to you, you need to get formal instruction.  Depending on the work, this can be very critical (and sometimes a safety consideration).  I would have your supervisor review any calculations you do, just in case.  You don't want the blame because you haven't had formal training.



I need more information:
Our Perchloric acid concentrate comes form Fisher and is 70.5% pure and in liquid form. I need a measurement in volume not grams. In the calculation, does it not need to be adjusted for density and specific
gravity.


Properties
Molecular FormulaHClO4

Molecular Weight100.46

CAS Number7601-90-3
EG/EC Number 2315124

MDL number MFCD00011325


vapor pressure  6.8 mm Hg ( 25 ¡ãC)

7 mm Hg ( 25 ¡ãC)

assay 69.0-72.0%

N compounds  ¡Ü0.001%

ign. residue  ¡Ü0.003%

color (APHA) ¡Ü10

Fp  >230 ¡ãF

density 1.664 g/mL at 25 ¡ãC (lit.)

1.664 g/mL at 25 ¡ãC

Cl-  ¡Ü0.001%

SO42-  ¡Ü0.001%

SiO32- and PO43-  ¡Ü5 ppm

Fe  ¡Ü1 ppm


Thank you'
Robert Pyle

Answer
The calculation I gave you did give volume (mL).  You will need to adjust for the 70.5%.

This table is on the internet 9I found after I replied), but you still need to know how to do the calculation.  See if you get the same answer.

http://delloyd.50megs.com/about.html