Colourless Powder Form.
CAS Number: 144-62-7 (anhydrous); 6153-56-6 (dihydrate)
Other names: Wood bleach
Mainly used for cleaning or bleaching, especially for the removal of rust (iron complexing agent)
Oxalic acid is a strong dicarboxylic acid occurring in many plants and vegetables, usually as its calcium or potassium salts. It is readily oxidized. It appears as colourless transparent crystals at room temperature. Spinach, amaranth, water spinach, mustard, black fungus, leek, swamp cabbage, onion, water bamboo and bamboo shoot have a high oxalic acid content.
Uses
1. It can be mainly used as reducing agent and bleaching agent, mordant for dyeing and printing industry, also used in refining rare metal, the synthesis of various oxalate compounds.
2. Used as laboratory reagents, chromatography analysis reagent, dye intermediates and standard material.
3. As a Cleaning Agent
Oxalic acid is an ideal chemical for cleaning purposes. Its bleach-like qualities maeke it perfect for sterilizing household items. It is also efficient in removing rust on various different surfaces. Today, it can be found as a passive ingredient in various cleaning products, bleaches and detergents. Textile mills and factories use it for bleaching in order to color cloths. Medical companies occasionally use the acid to purify certain chemicals or to dilute them further.
Example:
Oxalic Acid Wood Bleach
To remove stains:
- Dissolve 60g to 120g of oxalic acid crystals into 1L of hot water.
- Use solution while hot, with a scrub brush.
- Apply liberally allowing solution to remain on surface until desired lightness has been achieved.
- If the solution cools before job is finished, reheat solution (do not boil).
How to dispose of oxalic acid after use:
*Once neutralized can safely dispose of used oxalic acid liquid
* Once the acid has been neutralized, the addition of more bicarbonate of soda will not produce any more bubbles. The neutralized acid may then be disposed of by tipping it down the drain.
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