Carat Gold
Jul 31
2011
2011
Comments Off
what kind of reactions is visible when the less carat gold coin is tested in concentrated HCL &HNO3 solutions?
please tell me the correct method of finding the gold contents in ancient coins by using chemicals (which chemicals & its ratio) and what kind of reactions will be found, if there is any percentage of gold contents?
If you take a sample of the coin and mix it with aqua reqia (a 5:1 solution of HCl and conc. HNO3) the metals will dissolve. Gold is oxidised by the nitric acid to Au3+, which is complexed by the chloride to Au(Cl4)- (can't do subscripts). This drives an equilibrium forward, causing more gold to dissolve.
Gravimetric method: By boiling with hydrogen peroxide, the gold will precipitate out, but I'm not sure what other metals will. Copper definitely will not. By filtering the solution and igniting to dryness, the amount of gold can be determined gravimetrically.
Atomic absorption: A more selective test, dilute the gold solution and use in an AA apparatus. Compare to a calibration curve and compensate for dilution factors.
Hope this helps.
Johnossi - 18 Karat Gold
|
|
RARE ANTIQUE VINTAGE 1 CARAT FANCY CANARY YELLOW & WHITE DIAMOND 14K W/GOLD RING $1,150.00 |
|
|
CRAZY UNIQUE 2 CARAT DIAMOND RUBY 14K PINK ROSE GOLD DECO RETRO 1940'S RING SALE $995.00 |
|
|
Vintage 14k White Gold 2.02 carat t.w. Marquise & Baguette Cut Diamond Band $1,995.00 |
|
|
FIAGRO 9 CARAT YELLOW GOLD CHAIN 12 GRAMS 24 INCHES $568.91 |
|
|
SMALL 3 DIMENSIONAL 9 CARAT GOLD CROSS $69.53 |
|
|
VINTAGE DIAMOND DAISY CLUSTER RING 9CT GOLD 0.10 CARAT $156.45 |
|
|
Beautiful 14kt White Gold 3/4 Carat Diamond Love Knot Estate Earrings! $199.00 |
|
|
Estate 14kt Gold 3.20 Carat Emerald Cut Aquamarine & 1/3 Carat Diamond Ring $490.00 |
|
|
Vintage ring. 9 Carat white gold, diamond and garnet. Boxed. Lovely gift. $39.49 |
|
|
Estate 14K White Gold 1/4 Carat TW Diamond Stud Pierced Earrings $49.99 |
|
|
14k Art Deco White Gold Diamond Solitaire Ring, 1/4 carat Engagement Ring, Sz 6 $165.00 |
|
|
BAROQUE/GEORGIAN TABLE CUT DIAMONDS BROOCH/PENDANT HIGH CARAT GOLD-3 DAYS ONLY! $495.00 |
|
|
3 CARAT CABACHON OPAL 14K YG PENDANT W/ DIAMOND ACCENT $299.00 |
|
|
Antique 14K GOLD Oval 7 1/2 Carat Basket Claw setting Amethyst Cocktail Ring $449.00 |
|
|
14KT YELLOW GOLD CLAW SET 15 x 2.55 CARAT WEIGHT MARQUISE DEEP BLUE SAPPHIRES $739.28 |
|
|
*ESTATE*LARGE 7.00CARAT VIBRANT GREEN QUARTZ SOLITAIRE RING 10K SOLID GOLD sz5.5 $229.99 |
|
|
Antique Victorian 9ct Gold 18 Carat Smoky Quartz Bangle Bracelet 17.1 grms $12.50 |
|
|
4 CARATS~WATERFALL~COCKTAIL RIGHT HAND YELLOW GOLD PLATED 18K GP CZ RING SIZE 7 $19.95 |
|
|
Gorgeous 14K GOLD DIAMOND SOLITAIRE EARRING-Single STUD-.10 carat-VINTAGE JEWEL $99.99 |
|
|
VINTAGE 7 CARAT NATURAL AQUAMARINE & DIAMOND ESTATE RING 14K W GOLD $36.00 |
|
|
GORGEOUS VICTORIAN ROSE GOLD 35 CT. CARAT FIERY OPAL FRINGE NECKLACE $290.00 |
|
|
Finest ART DECO 14K GOLD DIAMOND Lavalier NECKLACE-.20 carat tw-ANTIQUE ESTATE $4.99 |
|
|
Estate 14K Yellow Gold 3/4 Carat Pave Diamond Earrings Princess Cut Stones $31.00 |
|
|
Vintage 10K GOLD Ring Quarter Carat DIAMOND Size 12 Wedding Engagement $109.99 |
|
|
Estate Ladies Solid Gold 14kt Watch 1/3 Carat Diamonds 33.4g 22 Vintage Jewel 7" $999.99 |
|
|
ART DECO DIAMOND RING 14K YELLOW GOLD 1/2 CARAT PLUS $399.20 |
|
|
9 CARAT YELLOW GOLD CHESTER 1918 MEN'S SIGNET RING SIZE V $15.80 |
|
|
Nice 1 Carat 19 Diamond Crossover Ring YG Size 8 $299.99 |
|
|
LADIES 1/2 CARAT DIAMOND FLOWER CLUSTER RING YG SIZE 6 $269.00 |
|
|
Estate Vintage Art Deco 14K Yellow Gold .65 Carat Blue Sapphire Ring $245.00 |
|
|
14KT White Gold VVS & D color 1.5 carat Diamond Onyx Playboy Pendant insert. $1,500.00 |
|
|
Estate Quality 21kt solid Gold 1 Carat Ruby ladies Post Earrings! $595.00 |
|
|
14KT GOLD .60 CARAT DIAMOND DOME RING HUGH HEAVY 14.1 GRAMS $1,295.00 |
|
|
VINTAGE BIG .50 CARAT DIAMOND RING WOW! $134.33 |
|
|
Fine Art Nouveau 3 carat Amethyst gold pendant and chain $1.96 |
|
|
BEAUTIFUL ANTIQUE 18CT WHITE GOLD RING WITH APPROX 1.20 CARAT OF DIAMONDS $2.28 |
|
|
9 Carat Gold Chinese Carved Jade Ring $1.64 |
|
|
Victorian 9 Carat Gold Eye Glass Pendant $34.75 |
|
|
Fabulous 14kt White & Yellow Gold 2.00 Carat Pave Diamond Estate Bracelet! $999.00 |
|
|
ANTIQUE ART DECO DIAMOND RING 14K WHITE GOLD 1/3 CARAT $639.20 |
|
|
Fast Weigh MS-500-BLK Digital Pocket Scale, 500 by 0.1 G $4.50 Introducing the M-500 from Fast Weigh Scales! This hip little scale is one of the hottest and most economical scales on the market today! The removable cover keeps the scale protected when not in use and also doubles as an expansion tray. Just replace the plastic cover when your done using it, and you can safely toss the scale in your handbag or pocket with no worries. Features: * A stylish yet ec... |
|
|
Frieling Coffee-for-One Filter, 23 karat gold plated $13.62 This coffee brewer is just the right size for an individual serving of coffee. The brewer features a permanent gold-plated foil filter which produces a more superior cup of coffee, that is richer in flavour and aroma, than coffee brewed using paper filters. The brewer is easy to use: simply put ground coffee into filter; place the water regulator on top; then place the brewer onto a mug and pour h... |
|
|
American Weigh DIA20 Digital Carat Scale, 100 by 0.005 CT $16.00 Four different weighing units (g, ct, dwt, gn,) Includes tweezers, (2) 10g calibration weights, and carrying case Capacity 20g / 100ct / 308.8gn / 12.86dwt |
|
|
10 Carrot Diamond $10.47 18 songs, Lyrics included. Ages 2 - 8.Winner of the Canadian Juno Award (equivalent of a Grammy), Parents' Choice Classic Award and American Library Association Award. A Canadian Gold Record! A Best Seller! Songs include: * Four Hugs a Day * I Wanna Be a Dog * La Bamba * The Garden Song (Inch by Inch) * Looking for Dracula * Stella, Stella Oga ... |
|
|
The Hunter (24 Karat Gold CD) $25.61 All products are BRAND NEW and factory sealed. Fast shipping and 100% Satisfaction Guaranteed.... |
|
|
Famous Blue Raincoat (24 Karat Gold CD) $24.48 All products are BRAND NEW and factory sealed. Fast shipping and 100% Satisfaction Guaranteed.... |
|
|
Warner Bros. Cartoons Golden Jubilee 24 Karat Collection - A Salute to Chuck Jones [VHS] $12.95 ... |
|
|
Krylon 1000 Premium Metallic Spray Paint, Gold $3.73 Crafter's metallic spray is safe for most surfaces, even styrofoam or plastic.... |
|
|
Silver Fineness Testing Set by PuriTEST! Test Jewelry, Antiques, Coins, Spoons, Flatware & More 999 985 950 925 Sterling Silverplate $17.99 Trusted by professionals.. easy enough for beginners. The acid test kit enables you to safely and accurately test the purity of silver items such as coins, jewelry and antiques. Test stone measures 6 inches x 3 inches; rubber backing holds stone in place while you test. This "scratch stone" is wonderful because it helps you acquire a sample to test (do not apply acid directly to your coin/jewle... |
|
|
ELECTRONIC GOLD TESTER GT 4000 6-24 KARAT $279.00 Detects karat value of the gold from 6 to 24 karats. Also detects platinum and separates solid gold items from gold plated ones. Provides a numeric reading on the LCD display that corresponds to the karat table. Manufacturers repair/replacement warranty. Specifications / Features: Size: 12 x 9 x 2 (305 x 254 x 50mm) Weight: 1.5 lb (0.7 kg) Power: two 9 volt batteries LCD Display... |
|
|
Luna Gold Necklace $912 Necklace in 18 carat Gold. |
|
|
Daisy Gold Necklace with Diamonds $2052 Necklace in 18 carat Gold with Diamonds, 0.22 carat. |
|
|
Solid 14K White Gold .03 Carat Genuine Diamond Toe Ring $204.28 Solid 14K White Gold .03 Carat Genuine Diamond Adjustable Toe Ring Genuine .03 Carat diamond toe ring. Add some twinkle to your toes with this solid gold toe ring. Specifications: .03 Carat Diamonds (ct. tw.), Solid 14K Gold, Adjustable Solid Gold Jewelry |
|
|
Solid 14K Yellow Gold .03 Carat Genuine Diamond Toe Ring $185.59 Solid 14K Yellow Gold .03 Carat Genuine Diamond Adjustable Toe Ring Genuine .03 carat diamond toe ring. Add some twinkle to your toes with this solid gold toe ring. Specifications: .03 Carat Diamonds (ct. tw.), Solid 14K Gold, Adjustable Solid Gold Jewelry |
|
|
Solid 14K Yellow Gold .02 Carat Genuine Diamond Toe Ring $209.49 Solid 14K Yellow Gold .02 Carat Genuine Diamond Adjustable Toe Ring Genuine .02 Carat diamond toe ring. Add some twinkle to your toes with this solid gold toe ring. Specifications: .02 Carat Diamonds (ct. tw.), Solid 14K Gold, Adjustable Solid Gold Jewelry |
