Nitric Acid 67% Lab Tech Grade
Description
Nitric Acid 67%
Laboratory / Technical Grade
*Excellent for gold refining
Nitric Acid 67% (42° Baumé) (HNO3) is a highly corrosive mineral acid widely used in various industrial application. It is a clear to pale yellow in color and is a strong oxidizing agent known for its corrosive properties. It is commonly used in chemical manufacturing, metal processing, and as a laboratory reagent.
Nitric Acid 67% Lab/Tech Grade Safety Data Sheet (SDS)
Nitric Acid 67% Lab/Tech Grade Certificate of Analysis (COA)
Nitric Acid plays a key role in refining gold, particularly in methods like aqua regia refining and in parting processes. Urban mining and pcb board gold recovery commonly uses nitric acid to dissolve gold. *Ships in Level 4 Fluorinated Polyethylene Bottles.
Aqua Regia Gold Refining Process (Most Common Use)
Aqua regia is a mixture of nitric acid (HNO₃) and hydrochloric acid (HCl) in a 1:3 ratio. This combination dissolves gold, which neither acid can do alone.
Step-by-step Overview:
Preparation of Aqua Regia:
Mix 1 part nitric acid with 3 parts hydrochloric acid.
Dissolution:
Add impure gold to the aqua regia.
Nitric acid oxidizes the gold to gold ions (Au³⁺).
Hydrochloric acid provides chloride ions (Cl⁻) to form chloroauric acid (HAuCl₄), which is soluble.
Filtration:
Filter the solution to remove impurities and undissolved metals.
Precipitation:
Add a reducing agent like sodium metabisulfite (Na₂S₂O₅) to the solution.
This causes pure gold to precipitate out of solution as fine particles.
Washing & Melting:
Wash the gold powder, dry it, and melt it to form pure gold bars or granules.
| Chemical Formula: | HNO3 |
| Molecular Weight: | 63.013 |
| CAS Registry Number: | 7697-37-2 |
| Appearance | Colorless to faint yellow |
| Odor: | Acrid |
| Density |
> 1.4078@ 25 °C |
| Boiling Point: | 248 'F 67.2% HNO3 |
| Solubility in water: |
Completely Soluble |
| GHS Pictograms: |
  
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| GHS Signal Word: | Danger |
| GHS Hazard Statements: | H272, H314, H330 |
| GHS Precautionary Statements | P210, P220, P260, P264, P271, P280, P284, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P320, P321, P363, P370+P378, P403+P233, P405, and P501 |
| UN Identification Number: | 2031 |
| Proper Shipping Name: | Nitric Acid |
| Transport Hazard Class: | 5.1, 8 |
| Packing Group: | II |
| DOT Placard: |
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SKU: NAL67-1QT
$39.56
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