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Why is there no colour change when a silver rod is put in blue copper sulphate solution?
When a silver rod is placed in a blue copper sulphate solution, there is no visible color change because silver is less reactive than copper. This means that silver does not displace copper from copper sulfate solution during the reaction, so the blue color of the copper sulfate solution remains unchanged.
What happens to gold when dipped into a solution of copper sulfate?
When gold is dipped into a solution of copper sulfate, a redox reaction occurs where copper ions in the solution gain electrons and are reduced to solid copper metal. The gold does not react and remains unchanged in the solution.
What happens during electrolysis of znso4?
It depends on the electrodes being used :1) If Pt(inert) electrodes are used, then the products will be:Cathode: Zn2+ + 2e- ------> ZnAnode: 2H20 ---------> 4H+ + O2 + 4e-(or) 4OH- ----------> O2 + 4H2O + 4e-(they are one and the same rxn )SO42- is a spectator ion here.Net rxn: 2Zn2+ + 2H2O ----------------> 2Zn + O2 + 4H+(or) 2ZnSO4 + 2H2O -----------------> 2Zn + O2 + 2H2SO4(use Pt electrode)Also if not mentioned, always inert electrodes i.e. Pt electrodes are taken.2) If very pure Zn electrodes are used, that too in an O2 free atmosphere, then the products will remain the same.3) If some Cu impurity is present in the Zn electrode, then at cathode H2O (or H+) is reduced instead of Zn .i.e. 2H+ + 2e- -----------> H2or) 2H2O + 2e- ---------> H2 + 2OH-Anode rxn remains the same.4) If s pure Zn electrodeare used in an O2 atmosphere, then again H2O (or H+) is reduced instead of Zn. (the rxns are similar to case 3)
What do you get when combining sodium sulfate and barium nitrate?
Combining sodium sulfate and barium nitrate would result in the formation of barium sulfate and sodium nitrate. Barium sulfate is a white precipitate that is insoluble in water, while sodium nitrate remains in solution.
What is the concentration of the SO42- ion that remains in solution after the reaction is complete?
The concentration of the SO42- ion that remains in solution after the reaction is complete is determined by the stoichiometry of the reaction and the initial concentration of the reactants.
What are inert and active electrodes?
Inert electrodes simply serve as electrical conductors and are unchanged by the cell processes. Active electrodes change during the cell reactions. An example of inert electrodes is platinum in the electrolysis of water. The platinum remains unchanged and the water is split into hydrogen and oxygen. An example of active electrodes is in the electrolysis of copper sulfate solution with copper electrodes. The anode copper is converted into copper ions in the solution, and metallic copper builds up on the cathode. The term active electrode is also used in eeg measurement, here as the opposite to passive electrode. Electrodes are the pads attached to the skin to get readings, and active ones don't need a conductive paste to get a good signal.
Why do you use molten NaCl in electrolysis instead of an aqueous solution of NaCl?
Molten NaCl is preferred over an aqueous solution of NaCl in electrolysis because in the molten state, NaCl dissociates into Na+ and Cl- ions without the presence of water molecules, allowing for direct electron transfer at the electrodes. In an aqueous solution, water molecules also undergo electrolysis, leading to the production of hydrogen gas and oxygen gas, which can interfere with the desired reactions involving Na+ and Cl- ions. Additionally, the high melting point of NaCl ensures that it remains in the molten state during the electrolysis process, providing a stable environment for the reactions to occur.
What is electrolysis Describe how this process can b used to differentiate between an element and a compound?
Electrolysis is a chemical process that uses electrical energy to drive a non-spontaneous reaction, typically involving the decomposition of a substance into its constituent elements. By applying an electric current to a compound dissolved in a solution or molten state, it can be broken down into its elemental components. If the substance produces distinct elements at the electrodes during electrolysis, it confirms that the original substance is a compound. In contrast, if no decomposition occurs and the substance remains unchanged, it indicates that the material is an element.
What is made when iron sulphate and sodium carbonate are mixed?
When iron sulfate and sodium carbonate are mixed, iron carbonate and sodium sulfate are produced. Iron carbonate is a solid precipitate that can be formed during the reaction, while sodium sulfate remains in solution.
What is the reaction of potassium chromate with barium sulphate?
When potassium chromate reacts with barium sulfate, a precipitation reaction occurs. Barium chromate is formed as a yellow precipitate, while potassium sulfate remains in solution. This reaction can be used to detect the presence of sulfate ions in a solution.
Name an ion which goes to the anode and is not discharged?
Sulfate ion (SO4^2-) goes to the anode in electrolysis but is not discharged. It remains in the solution due to its stability.
Barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride?
Yes, it is true. The equation of reaction is :- BaCl2 + Na2SO4 --------> 2NaCl(aq.) + BaSO4 where solution is of sodium chloride and Barium sulphate settles down at the bottom as precipitate
Why is there no colour change when a silver rod is put in blue copper sulphate solution?
When a silver rod is placed in a blue copper sulphate solution, there is no visible color change because silver is less reactive than copper. This means that silver does not displace copper from copper sulfate solution during the reaction, so the blue color of the copper sulfate solution remains unchanged.
What happens to gold when dipped into a solution of copper sulfate?
When gold is dipped into a solution of copper sulfate, a redox reaction occurs where copper ions in the solution gain electrons and are reduced to solid copper metal. The gold does not react and remains unchanged in the solution.
Why molarity of a solution remains constant?
Molality of a solution remains constant as mass of a solution independent of temperature.
Why is the reaction between barium chloride and sodium sulphate also called presipitation reaction?
It is because the white precipitate of barium sulphate by the reaction of SO4(VALENCY -2) AND BA2.THE OTHER PRODUCTS FORMED IS SODIUM CHLORIDE WHICH remains in the solution. This is an example of double displacement reaction. NA2SO4(aq)+BACl2(aq) -- BASO4(S)+2NACl(aq)
When electric current is passed through a strong solution of brine then what will happen?
When electric current is passed through a strong solution of brine (sodium chloride in water), electrolysis occurs. Chlorine gas is produced at the anode, sodium metal at the cathode, and sodium hydroxide remains in solution. This process is known as the chlor-alkali process.
