Search results
Results from the WOW.Com Content Network
Boron, often in the form of boric acid or sodium borate, is combined with water — a cheap and plentiful resource — where it acts as a coolant to remove heat from the reactor core and transfers the heat to a secondary circuit. [6] Part of the secondary circuit is the steam generator that is used to turn turbines and generate electricity.
Boric acid is a weak acid, with pK a (the pH at which buffering is strongest because the free acid and borate ion are in equal concentrations) of 9.24 in pure water at 25 °C. But apparent p K a is substantially lower in swimming pool or ocean waters because of interactions with various other molecules in solution.
Water boration (the addition of boric acid to the moderator/coolant) which is commonly employed in pressurized light water reactors also produces non-negligible amounts of tritium via the successive reactions 10 5 B (n, α) 7 3 Li and 7 3 Li (n,α n) 3 1 T or (in the presence of fast neutrons) 7 3 Li (n,2n) 6 3 Li and subsequently 6 3 Li (n,α ...
Boron trifluoride reacts with water to give boric acid and fluoroboric acid. The reaction commences with the formation of the aquo adduct, H 2 O−BF 3, which then loses HF that gives fluoroboric acid with boron trifluoride. [22] 4 BF 3 + 3 H 2 O → 3 H[BF 4] + B(OH) 3. The heavier trihalides do not undergo analogous reactions, possibly due to ...
These thermal neutrons are ... operators by adding boric acid or by diluting with water to manipulate reactor power. ... water must be 99.75% pure to enable reactions ...
This reaction is very fast, with characteristic time less than 10 μs. [13] Polymeric boron oxoanions are formed in aqueous solution of boric acid at pH 7–10 if the boron concentration is higher than about 0.025 mol/L.
The halides react with water to form boric acid. [1] ... However, h-BN is a relatively poor electrical and thermal conductor in the planar directions. [4] [5]
Boric acid will initially decompose into steam, (H 2 O (g)) and metaboric acid (HBO 2) at around 170 °C, and further heating above 300 °C will produce more steam and diboron trioxide. The reactions are: H 3 BO 3 → HBO 2 + H 2 O 2 HBO 2 → B 2 O 3 + H 2 O. Boric acid goes to anhydrous microcrystalline B 2 O 3 in a heated fluidized bed. [22 ...