How to identify Nitric acid? Detection of nitric acid: When some copper ingot mixed with concentrated nitric acid is heated in a test tube, brown nitrogen dioxide gas is evolved and the solution in the test tube turns blue due to the formation of copper nitrate. Cu + 4HNO3 = Cu (NO3)2 + 2NO2 ↑ […]
A small amount of dilute Nitric acid (HNO3) is added to a test tube with freshly prepared Ferrous sulphate solution. The test tube is cooled with cold water. Now concentrated sulfuric acid (H2SO4) from another test tube is poured very slowly down the tube into the first test tube. H2SO4 is heavy and sinks to
Can dilute HCL solution be kept in a copper vessel? Answer: Copper ranks below hydrogen in the electrochemical class. So copper is less electropositive than hydrogen. Therefore copper cannot replace hydrogen in dilute hydrochloric acid (HCL). That is, copper does not react with dilute hydrochloric acid. So dilute hydrochloric acid can be kept in copper
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Name an air pollutant obtained by boiling copper with H2SO4 Answer: Boiling copper with concentrated sulfuric acid produces Sulfur dioxide, which is an air pollutant. Cu + 2H2SO4 = CuSO4 + SO2 ↑ + 2H2O
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How does H2SO4 damage buildings made of Marble? Buildings made of marble stone can be damaged by exposure to Sulfuric acid (H2SO4). Marble stone is calcium carbonate (CaCo3). Sulfuric acid (H2SO4) reacts with calcium carbonate to produce calcium sulphate (CaSO4), carbon dioxide and water. As a result, buildings made of marble stone are damaged by
Copper cannot be used in the preparation of Hydrogen from dilute sulfuric acid, but zinc can—why? Answer: Metals below hydrogen in the electrochemical series do not react with dilute sulfuric acid. Copper ranks below hydrogen and zinc ranks above hydrogen in the electrochemical series. Therefore, zinc reacts with dilute H2SO4 to produce hydrogen, but not
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Why does sugar turn black when concentrated Sulfuric acid is added to sugar? Answer: Concentrated Sulfuric acid is a strong hygroscopic substance. Adding concentrated H2SO4 to sugar causes the H2SO4 to absorb all the water content of the sugar and the sugar is converted to carbon. So the sugar turns black. C12H22O11 + Conc. H2SO4
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Sulfuric acid is a strong oxidizing agent—Proof: When hydrobromic acid is heated in a test tube with concentrated H2SO4, red bromine gas is released. By this, H2SO4 oxidizes hydrobromic acid to liberate bromine. 2HBr + H2SO4 = Br2 + SO2 + 2H2O
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Sulfuric acid is a strong hygroscopic substance – Proof: When concentrated H2SO4 is added to sugar, the H2SO4 absorbs all the water content of the sugar and the sugar turns into black carbon. C12H22O11 + Conc. H2SO4 = 12C + [11H2O + H2SO4 ] This shows that sulfuric acid is a very strong hygroscopic substance.
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Sulfuric Acid Detection A white precipitate of barium sulphate is formed when barium chloride solution is added to a test tube with concentrated or dilute H2SO4. This precipitate is insoluble in HCl or HNO3. Sulfuric acid is detected by this test. H2SO4 + BaCl2 = BaSO4 ↓ + 2HCl Sulfuric acid does not react with
