The Vespiary

The Hive => Chemistry Discourse => Topic started by: chemrat on June 25, 2004, 12:23:00 AM

Title: Formic acid + Hydrogen peroxide= heat ?
Post by: chemrat on June 25, 2004, 12:23:00 AM

Hi !!
Reading the documentation about the performic reaction I've tried to understand that Hydrogen peroxide and formic acid have to be mixed well about an hour before the reaction, and that mixing cause heat.

This is a problem for me, because I've tried but the liquid don't warms up.

My formic acid is reagent-grade 99% purity and hydrogen peroxide is
a industrial product for bleaching the wood, is 130 volumes and should
work well according to Eleusis.

I have mixed the reagents  with a magnetic stirrer for two hours but nothing
happens. Somebody know more ?

Title: performic acid
Post by: GC_MS on June 25, 2004, 12:30:00 AM

Don't worry, the reaction is not that exothermic. If you make small quantities of performic acid solution, it is absolutely normal that no temperature change is noticed.

Adding the performic acid to an alkene on the other hand, will most definitely result in an exothermic reaction.

After a few hours, you will notice gas bubbles in your performic acid solution as well. But it will remain colorless.

Title: 130 volumes ?
Post by: psyloxy on June 25, 2004, 12:31:00 AM

Uhm, what's the strenght of the peroxide in % H2O2 by weight ?

--psyloxy--

Title: H2O2 Concentration vs. volume
Post by: Sredni_Vashtar on June 25, 2004, 02:56:00 AM

You can interpolate from this table:

(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000515213-pic01a.gif)

(130 volume is approx. 35%)

Title: Aqueous H2O2 Concentration vs. density / mp / bp
Post by: Rhodium on November 03, 2004, 03:30:00 PM

(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000515213-file_uun2.gif)

https://www.thevespiary.org/rhodium/Rhodium/chemistry/pictures/h2o2.bp-mp-conc.chart.gif (https://www.thevespiary.org/rhodium/Rhodium/chemistry/pictures/h2o2.bp-mp-conc.chart.gif)

(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000515213-file_uun2.gif)

https://www.thevespiary.org/rhodium/Rhodium/chemistry/pictures/h2o2.density-conc.chart.gif (https://www.thevespiary.org/rhodium/Rhodium/chemistry/pictures/h2o2.density-conc.chart.gif)

(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000515213-pic11a.gif)

Reference:

H2O2.com - Physical and Chemical Properties of Hydrogen Peroxide (http://www.h2o2.com/intro/properties.html)

(http://www.h2o2.com/intro/properties.html)

H₂O₂ conc/density:

Post 243407 (https://www.thevespiary.org/talk/index.php?topic=11347.msg24340700#msg24340700)

(lugh: "Hydrogen Peroxide Concentrations/Density", Novel Discourse)

_{Keywords: Hydrogen Peroxide H2O2 Concentration Charts Density melting point boiling point correlation solid liquid phase diagram}