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What is formed when solid copper sulphate is mixed with water?
Take a cupful of water in a beaker and add few drops of dilute sulphuric acid. Heat water. When it starts boiling add copper sulphate powder slowly while stirring continuously. Continue adding copper sulphate powder till no more powder can be dissolved. Filter the solution. Allow it to cool. Do not disturb the solution after some time. We can see the crystals of copper sulphate. If we do not see any crystals, wait for some more time. Your copper sulphate crystal is ready. By: darani.a
What is principle of potassium dichromate in COD estimation?
The titer volume of the sample gives the volume of Ferrous Ammonium Sulphate required to react with the excess potassium dichromate in the solution. Similarly, the titer volume for the blank (distilled water) gives the volume of Ferrous Ammonium Sulphate required to react with the excess potassium dichromate in the blank. The equation for the titration can be expressed as: Cr2O72 -- + FeSO4 (NH4)2SO4 = Cr+ + NH4+ + Fe 3+ From above equation it can be seen that one molecule of dichromate corresponds to one molecule of Mohr's salt. Thus, the difference in volume of excess K2Cr2O7 reacting with Mohr's solution can be calculated from the expression: = (Original vol. K2Cr2O7 -- vol. of K2Cr2O7 used for oxidation) solution - (Original vol. K2Cr2O7 -- vol. of K2Cr2O7 used for oxidation) blank = (Vol. of K2Cr2O7 used for oxidation) blank - Vol. of K2Cr2O7 used for oxidation) solution Hence, the difference in the titer volume for the solution and the blank is used to find out the Chemical Oxygen Demand directly.
How can you see copper sulphate dissolve in water?
Take some copper sulfate solid and add it to a beaker of water. Stir and you will see that the solid slowly disappears to form a blue solution. Copper sulfate has dissolved and is therefore soluble in water. Anhydrous copper sulfate is a white solid while hydrated copper sultate (CuSO4.5H2O) is blue.
Why does excess ammonia have to be added to copper ions solution to obtain the deep blue complex of copper tetra amine?
When excess ammonia is added to a solution of copper(II) ions, a complex will form between the ammonia molecules and copper(II) ions, dissolving the copper hydroxide precipitate that initially forms to form a deep-blue solution, Cu(NH3)42+. The ammonia molecules attach one at a time, and in between each attachment, there is a chemical equilibrium. The more ammonia is added, the more complex is formed, as the equilibrium is pushed to the product side. The blue color is the result of the complex absorbing light in the visible light spectrum, and having a concentration high enough for the eyes to detect.
What kind of reaction takes place when a copper wire is added to a beaker of silver nitrate?
A single-displacement reaction occurs where copper replaces silver in the silver nitrate solution to form copper(II) nitrate and solid silver. The blue color of the copper(II) nitrate solution turns a greenish-blue color due to the presence of excess copper ions.
What do copper sulphate crystals form when a hot saturated solution of copper sulphate is cooled?
Copper sulphate crystals form when a hot saturated solution of copper sulphate is cooled down. As the solution cools, the solubility of copper sulphate decreases, causing the excess copper sulphate to come out of the solution and form crystals.
What happens when excess hydroxide solution is added to copper II sulphate solution?
When excess hydroxide solution is added to copper II sulphate solution, a precipitate of copper II hydroxide forms. The balanced chemical equation for this reaction is CuSO4 + 2NaOH -> Cu(OH)2 + Na2SO4. In this reaction, the blue color of the copper II sulfate solution turns into a light blue precipitate of copper II hydroxide.
Why does one of the reactant copper carbonate is added in excess when preparing a sample of copper sulphate crystals?
Excess copper carbonate is added to ensure that all the copper sulphate is fully converted. This helps to make sure that all the starting material is used up and that the reaction goes to completion, resulting in a higher yield of pure copper sulphate crystals.
How do you separate sand and copper sulphate and to obtain copper sulphate crystals in dry state?
copper sulphate is soluble.dissolve the two in water whereby cuso4 dissolves.filter the mixture the put the filtrate in an evaporating dish to evaporate excess water.do not evaporate to dryness coz some water ir required for crystalization.
What happens when the temperature of a saturated copper sulphate solution is increased?
When the temperature of a saturated copper sulfate solution is increased, its solubility also increases. This means that more copper sulfate can dissolve in the solution at higher temperatures. However, as the solution cools back down, some of the excess copper sulfate may precipitate out of the solution.
Why was the copper II oxide added in excess to dilute sulfuric acid to form the soluble salt copper II sulphate?
Copper II oxide was added in excess to ensure that all the sulfuric acid reacted, forming water and copper II sulfate. This method helps to avoid any excess sulfuric acid remaining in the solution, ensuring that all copper II oxide reacts completely to form the desired copper II sulfate salt.
How do you determine the sulphate?
Sulphate ions can be determined using methods such as gravimetric analysis, titration with barium chloride, or ion chromatography. In gravimetric analysis, sulphate ions are precipitated as barium sulphate and weighed. Titration with barium chloride involves adding a known volume of barium chloride solution to the sample containing sulphate ions, and the excess barium chloride is back-titrated with a standard solution of a titrant such as potassium chromate. In ion chromatography, separation and quantification of sulphate ions are done using a chromatographic column with specific properties.
What happens when ammonia is added to copper sulfate?
When Ammonia solution is added to Copper sulphate, at first a precipitate of Copper hydroxide is formed. If excess ammonia is added, finally a deep bluish solution of Tetraamine Copper(II) Sulfate is formed
What is formed when solid copper sulphate is mixed with water?
Take a cupful of water in a beaker and add few drops of dilute sulphuric acid. Heat water. When it starts boiling add copper sulphate powder slowly while stirring continuously. Continue adding copper sulphate powder till no more powder can be dissolved. Filter the solution. Allow it to cool. Do not disturb the solution after some time. We can see the crystals of copper sulphate. If we do not see any crystals, wait for some more time. Your copper sulphate crystal is ready. By: darani.a
Where is the excess copper from after adding zinc to copper sulfate?
The "excess" metallic copper produced by adding zinc metal to a copper sulfate solution comes from exchanging zinc atoms from the metal for copper atoms from the copper sulfate solution. During the reaction, the zinc atoms are ionized to cations and the copper cations from the solution are reduced to neutral atoms.
What is observed when copper oxide is added into excess dilute sulphuric acid?
When copper oxide is added into excess dilute sulphuric acid, it reacts to form copper sulfate and water. Additionally, hydrogen gas is evolved during the reaction.
Why do we add an excess of copper carbonate to sulphuric acid when preparing the salt copper sulphate?
Adding an excess of copper carbonate ensures that all the sulfuric acid is fully neutralized and reacts with the copper carbonate to form copper sulfate. This guarantees that the maximum amount of copper sulfate is produced during the reaction.
