Which is stronger ENT or H CO

Understand chemistry 4, textbook

37 Basic pattern of chemical reactions  Learning objective check 10, page 92 3. The nitric acid (HNO 3) If there is nitric acid on it (Fig. 37.1) Put on protective goggles. Place small pieces of sausage, cheese, and sheep's wool in a glass bowl. Carefully put a few drops of 10% nitric acid on it with a pipette. What reaction can you observe? A yellow coloration occurs at V3. Substances containing protein are discolored yellow by nitric acid. We also call this reaction the xanthoprotein reaction (Greek xanthos = yellow). Make sure that the acid does not get on your skin (very corrosive and yellowish skin discolouration)! In addition to sulfuric acid and hydrochloric acid, nitric acid is also a very strong acid. It decomposes the precious metal silver. Only the metals gold and platinum are resistant to the acid. With 50% nitric acid, silver could be extracted from gold. This is why the acid was also known as septic fluid. If 1 part HNO 3 is mixed with 3 parts HCl, we get what is known as aqua regia. It even dissolves gold. M Nitric acid is formed by combining nitrogen dioxide with oxygen and water. 4 NO 2 + O 2 + 2 H 2 O  4 HNO 3 A mixture of 1 part concentrated nitric acid and 3 parts hydrochloric acid will even dissolve gold. With the help of nitric acid, fertilizers, dyes and explosives are made. 4. Carbon dioxide (H 2 CO 3) With or without carbon dioxide (Fig. 37.3) Fill two test tubes with soda water. Check the fresh soda water with universal indicator paper or pH test strips. Bring the water in the second test tube to the boil briefly and also measure the pH. What difference can you see? At V4, the pH value of fresh soda water is slightly more acidic than that of boiled water. The water loses its dissolved CO 2 when it is heated and the carbonic acid also breaks down again into H 2 O and CO 2. Carbonated water can therefore only be stored under pressure and in a cool place. At +20 ° C, 1 liter of water can dissolve 0.87 liters of CO 2. M Carbonic acid is formed by combining carbon dioxide with water. CO 2 + H 2 O  H 2 CO 3 It is common to inject CO 2 into mineral water. About 0.1% of the dissolved carbon dioxide combine with water to form carbonic acid. V3 V4 37.3 With or without carbonic acid 37.1 If there is nitric acid on it 37.2 Nitric acid for the production of nitrogen-phosphorus-potassium fertilizer 37.4 Acid protection suits 37.6 Mineral water and its ingredients 37.5 CO 2 cartridge for the preparation of carbonated water For test purposes only - property of the publisher öbv

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