1. Put the jewelry with the density to be measured into a measuring cylinder filled with 200ml aqueous solution, and the number of milliliters that the liquid level rises, that is, the volume of jewelry boiling water, is also the volume of jewelry. Here we assume that the volume of jewelry is V cubic centimeters. (Note 1 ml = 1 cm3)
2. Weigh the quality of jewelry with a balance. Put the jewelry in the left plate of the balance, and put an appropriate amount of weight in the right plate of the balance, and adjust the whole travel code to balance the balance. The quality of jewelry is the weight plus the grams represented by the travel code. Here we might as well assume that the quality of jewelry is m grams.
The density of this jewelry is m/v, calculate the specific value. The real gold weight of one cubic centimeter19.3g, and the real silver weight of one cubic centimeter10.5g.. You can see the truth by comparison.
Second, identify the authenticity of gold and silver jewelry by burning.
1, "real gold is not afraid of fire" put gold jewelry in the fire to burn red. After cooling, if the jewelry surface is still golden yellow, it is real gold, and if it turns black, it is fake gold.
2. The silver of real silver jewelry will remain unchanged after burning. If the fineness of silver is low, it will turn black.
Third, use chemical knowledge to identify the authenticity of gold and silver jewelry.
1, gold jewelry, take 1: 3 nitric acid and put it on the object for half a minute. If it bubbles or bubbles, wipe it with cotton wool or white paper. If it is blue-green, it must be copper or copper alloy counterfeit; If it does not react with nitric acid and does not develop color, it is generally a genuine product with toughness and hardness.
2, silver jewelry, still take a drop of 1: 3 nitric acid on the object, put it in light salt water after half a minute, if there is white turbidity, it can be regarded as genuine.
Fourth, how much gold jewelry contains depends on special tools such as touchstones.