PowerLabs Potassium Styphnate
Synthesis

A POWERLABS exclusive!!!

Potassium Styphnate
(2,4,6-Trinitrobenzene-1,3-diol, Potassium salt) Laboratory
Synthesis:

INTRODUCTION:

Similarly to Picric Acid (TriNitroPhenol), Styphnic Acid (TriNitroResorcinol) is
explosive and prone to forming metal salts which are more sensitive than the
original acid. Potassium
Picrate is vastly more explosive than picric acid, detonating if ignited
confined, but still only mildly explosive if compared to more practical low
explosives. The second hydroxide ion on Styphnic Acid makes it more reactive and
less stable than the more symmetric Trinitrophenol molecule (this becomes very
obvious on flame tests, for example), so Potassium Styphnate should be more
explosive than the picrate version of that explosive. Armed with this theory and
no actual practical information on the explosive itself it was decided to
attempt a synthesis in order to evaluate just exactly how the explosive
behaved.

MATERIALS:

Reactants:

Glassware:

Potassium Carbonate (KCO3(s))

250mL Glass beaker.

Styphnic Acid
(C6H3N3O8)

Pipette

Distilled Water (H2O(l))

Stirring Rod

Funnel/filter
paper

Here all the chemicals used in the synthesis are seen, from left
to right, back to front: Distilled water, Potassium Carbonate, Styphnic Acid
Solution, 50mL glass beaker, spatula, glass rod.

PROCEDURE:

C6H3N3O7(aq)
+ KCO3(aq) =>
KC6H2N3O7(s) + CO2(g)
[Heat of formation: +?? Cal/mole].

A
saturated solution of Styphnic acid is prepared by dissolving the acid on hot
(near boiling) water.

Potassium Carbonate is added to the mixture until no more CO2 is evolved and the
pH tests neutral. The color goes from yellow to orange and some precipitate
starts to form.

As the solution is cooled gradually to 0C, the potassium styphnate crystallizes
out of it  forming a large mass of crystals. Yield can be maximized by
boiling the solution to half of its original volume and than cooling it to 0C,
at which temperature the greatest number of crystals form.

After washing and drying the crystals stick together in soft clumps, forming a
mass slightly larger than what was started out with in Styphnic Acid. These
crystals are mildly sensitive to impact and friction, and deflagrate violently
from flame.

RESULTS:

The product deflagrates very violently when subjected to
flame, forming a spectacular fireball in even small amounts, and releasing a
mushroom cloud of smoke (Potassium Oxide, CO2, N2, Carbon sooth) in the process.
It is only somewhat sensitive to impact or friction (requires a lot of force to
go). 158k .mpg

C6H2N3O7K
--> combustion--> 6 CO2 + 2 H2O + 0.5 K2O + 1.5 N2 [heat of combustion by
"free oxygen" Hc of 2317.67 kcal/kg].

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Last updated 30/01/04

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