The Y4- ions form 1:1 complexes with metal ions. For example, Ni2+ ions bind with them to form a stable octahedral complex NiY2-. An ordinary indicator cannot be used since the reaction does not involve a simple acid – alkali neutralisation so the end point of an EDTA complexometric titration can be detected by means of a metal ion indicator ...
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Ethylenediaminetetraacetic acid ( EDTA ) is a hexadentate ligand which forms stable composites with most metal ions. therefore is widely used to find metals in complexometric titrations. EDTA can be represented as H4Y and in alkalic conditions. it exists as Y+ ions: The Y4- ions form 1:1 composites with metal ions. For illustration.
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Jul 29, 2020 · Cations are the positive ions in a compound and are generally the metals. Anions are the negative, non-metal ions in the compound. Some non-metals are capable of forming cations, but metals will always form cations. For example, in NaCl, Na is the positively charged cation because it is a metal while Cl is the negatively charged anion because ...
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40 ml 0.125 M NiSO4 is electrolyzed by a current of 0.05 A for 40 min. (i) Write reaction at each electrode. (ii ) How many coulombs of electricity were used ? (iii) How many grams of substance were liberated at cathode? (iv) How long appropriate current has to be passed through the solution to separate metal ions completely?
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Leave one beaker of six (or seven, if CN- is being used) filled with NiCl2 or NiSO4 solution as a control. Add approximately 3 mL of 6M NH3 to the second beaker. Add approximately 0.5 mL of 25% ethylenediamine to the third beaker. Add approximately 1 mL of 25% ethylenediamine to the fourth beaker.
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Weak electrolytes have the tendency to ionize and then recombine. The balance between these opposing processes determines the relative numbers of ions and neutral molecules, which produces a state of chemical equilibrium in which the relative numbers of each type of ion or molecule in the reaction are constant over time.