<p><b>硼酸三鈉</b>是一種無機化合物，化學式為Na<sub>3</sub>BO<sub>3</sub>。它可由四硼酸鈉和氧化鈉在450 °C反應得到；或通過偏硼酸鈉或氧化硼和碳酸鈉在高溫反應製得。</p><p>它在水中部分水解：
</p>
<dl><dd>[BO<span><br>3</span>]<sup>3−</sup> +  H<span><br>2</span>O  ⇌ [BO<span><br>2</span>]<span>−<br></span> + 3OH<span>−<br></span></dd></dl><h2><span id=".E5.8F.82.E8.80.83.E6.96.87.E7.8C.AE"></span><span id="参考文献">參考文獻</span></h2>

<!-- 
NewPP limit report
Parsed by mw2306
Cached time: 20230505230431
Cache expiry: 1814400
Reduced expiry: false
Complications: []
CPU time usage: 0.221 seconds
Real time usage: 0.346 seconds
Preprocessor visited node count: 3254/1000000
Post‐expand include size: 64374/2097152 bytes
Template argument size: 18022/2097152 bytes
Highest expansion depth: 19/100
Expensive parser function count: 9/500
Unstrip recursion depth: 0/20
Unstrip post‐expand size: 2127/5000000 bytes
Lua time usage: 0.057/10.000 seconds
Lua memory usage: 2807263/52428800 bytes
Number of Wikibase entities loaded: 0/400
--><!--
Transclusion expansion time report (%,ms,calls,template)
100.00%  274.385      1 -total
 70.95%  194.679      1 Template:Chembox
 30.23%   82.953      1 Template:Chembox_Identifiers
 20.67%   56.725      1 Template:Reflist
 15.53%   42.623      1 Template:Cite_web
 13.93%   38.221      1 Template:Chembox_Hazards
  9.21%   25.260      1 Template:Chembox_Related
  7.72%   21.195     73 Template:Chembox_entry
  6.95%   19.069      3 Template:Le
  6.41%   17.598     11 Template:Chembox_CASCheck
-->
**硼酸三鈉**是一種無機化合物，化學式為 Na3BO3。它可由四硼酸鈉和氧化鈉在 450 °C 反應得到；或通過偏硼酸鈉或氧化硼和碳酸鈉在高溫反應製得。

它在水中部分水解：

　
: [BO 
3]3− +  H 
2O ⇌ [BO 
2]− 
  + 3OH−

## 參考文獻
14312-40-4