e she approximate er and lower limits of pH limits at each end? Explain High pl

Question

e she approximate er and lower limits of pH limits at each end? Explain High pl mt b) Low plt limit 7. Circle T for true and F for False. T or F Ethylene diamine T or F T or F The equivalence point is when the pH-pk ne can coordinate through both of its amine groups, therefore it is tetradentate coordinate The end point in a titration is when the indicator changes color. Metal ion indicators should bind more strongly than EDTA. EDTA is colorless when free in solution, but colored when bound to a metal. Most metal ions coordinate through six sites, therefore EDTA has a 1:1 T or F T or F T or F coordination reaction with them since it is hexadentate. T or F pH electrodes usually have an Ag/AgCl reference electrode half-cell built in. T or F In an EDTA titration, the metal ion indicator is added to the solution in excess so that the metal ions are all complexed. ApH meter should be calibrated at the same temperature pH electrodes that have been stored dry should be soaked for an hour or more before use. at which the measurement will be made T or F T or F T or F pH electrod es use a glass bulb with a standard concentration of H inside. 0 . The following molecule is how many dentate when fully deprotonated (as shown)? (circle only one of the numbers) 0 1 2 3 456 7 89 10

Explanation / Answer

False - Ethylendiamine is an example of bidentate

True - Endpoint is indicated when the color has changed

False - Half equivalence point is where PH = PKa

False - the formation constant of ions with EDTA is very high. EDTA replaces the metal ion indicator from its complex..

False - EDTA is colorless wether or not is bound to a metal ion, the color you see is because the indicator is left in its free form after the titration

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