3 0 are the approximate upper and lower limits of pH is the reason for these lim
ID: 561687 • Letter: 3
Question
3 0 are the approximate upper and lower limits of pH is the reason for these limits at each end? Explain measurement with glass pli etectrodes? a) High pH limit b) Low pH limit: 7. Circle T for true and F for False. T or F Ethylene diamine can coordinate through both of its amine groups, therefore it is tetradentate. T or F The end point in a titration is when the indicator changes color T or F The equivalence point is when the pH = pKa. T or F Metal ion indicators should bind more strongly than EDTA. T or F EDTA is colorless when free in solution, but colored when bound to a metal. T or F Most metal ions coordinate through six sites, therefore EDTA has a 1:1 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. T or F A pH meter should be calibrated T or F pé electrodes that have been stored dry should be soaked for an hour or more before use. T or F plH electrodes use a glass bulb with a standard concentration of H' inside. at the same temperature at which the measurement will be made. The following molecule is how many dentate when fully deprotonated (as shown)? . (circle only one of the numbers) 1 2 3 456 7 8 9 10Explanation / Answer
Solution:
1. False, Ethylene diamine is a bidentate ligand and can bond through 2 amine groups
2. True, an indicator is a weak organic acid or a base which changes its color in acidic or basic medium from being colorless in either the medium. Hence at the end point when there is an one drop excess of the acid or base they change the indicator changes its color.
3. False, at equivalence point ph= pka for a strong acid - weak base or a weak acid-strong base titration.
4.false, edta binds more strongly than a metal ion indicator
5. False edta is colorless either bound to the metal or free
6. True, edta has 1:1 ratio reaction with most of the metals having 6 coordinate sites.
7. True ph electrode has an inbuilt Ag /AgCl reference electrode
8. True, metal ion indicator is added in excess to make all the metal ions bound to the dye molecule.
9. True, ph meter should be caliberated often
10. True, ph electrode must be soaked in buffer solution of ph 7 before using in order to caliberate the eletrode.
11. True, the ph electrode has a glass bulb with H+ ions since the Ag/ AgCl electrode is dipped in HCl solution inside a glass electrode.
The Las given molecule acting as a ligand has 3 sites of binding to metal atom, I,e the 2 oxygen atoms with negative charge, and a nitrogen with lone pair of electrons can donate electron to metal d-orbitals hence form 3 coordinate bonds with a metal. Therefore the ligand given is tridentate.
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