Which of the following is a tridentate ligand?

Which of the following is a tridentate ligand?

Dien (diethylenetriamine) is a tridentate ligand.

Is Dien a bidentate ligand?

Ethylenediamine (H2NCH2CH2NH2, often abbreviated as en) and diethylenetriamine (H2NCH2CH2NHCH2CH2NH2, often abbreviated as dien) are examples of a bidentate and a tridentate ligand, respectively, because each nitrogen atom has a lone pair that can be shared with a metal ion.

How many ligands are in EDTA?

EDTA4- forms very stable complexes with most of the transition metals. This hexadentate ligand forms very stable complexes (usually octahedral structures) with most of the transition metals. The donor atoms in EDTA4- are the two N atoms, and the four, negatively charged O atoms.

Is EDTA a strong ligand?

EDTA is a moderately strong field, while (en ) is a strong field ligand.

Is EDTA an acid or base?

EDTA is a Weak Acid. EDTA, ethylenediaminetetraacetic acid, has four groups of carboxyls and two groups of amines that can serve as donors of electron pairs, or Lewis bases.

Why is pH 10 maintained in complexometric titration?

pH 10 buffer is used in EDTA titration because in EDTA Y4- is predominant, and we want Y4- to react with the metal ions that are present in the titration solution. This can be achieved by using a pH 10 buffer.

Does EDTA affect pH?

EDTA salts are more soluble in water as the pH increases: the more EDTA there is in the salt form, the higher the pH of a water solution, and therefore, the higher the room temperature solubility. This can be achieved by a gradual addition of concentrated sodium hydroxide solution to the EDTA solution.

What pH does EDTA dissolve?

around 7.5 – 8

What is the pH of EDTA?

approximately 4 to 6

Why is EDTA pH dependent?

The unusual property of EDTA is its ability to chelate or complex metal ions in 1:1 metal-to-EDTA complexes. The fully deprotonated form (all acidic hydrogens removed) of EDTA binds to the metal ion. Many of the reactions are pH dependent, especially the weaker forming complexes with Ca+2 or Mg+2.

Is EDTA a weak acid?

EDTA is a Weak Acid The specific form of EDTA in reaction 9.9 is the predominate species only at pH levels greater than 10.17.

Why is buffer added to EDTA titration?

A buffer solution is used in EDTA titration because it resists the change in pH. This is because all the reactions between the metal ions and EDTA are pH-dependent.

Why EBT is used in EDTA titration?

Applications. When used as an indicator in an EDTA titration, the characteristic blue end-point is reached when sufficient EDTA is added and the metal ions bound to the indicator are chelated by EDTA, leaving the free indicator molecule. Eriochrome Black T has also been used to detect the presence of rare earth metals.

What is the color of EDTA?

EDTA is short for ethylenediaminetetraacetic acid. A blue dye called Eriochrome Black T (ErioT) is used as the indicator. This blue dye also forms a complex with the calcium and magnesium ions, changing colour from blue to pink in the process. The dye–metal ion complex is less stable than the EDTA–metal ion complex.

What is the Colour of EBT indicator?

From Wikipedia In its protonated form, Eriochrome Black T is blue. It turns red when it forms a complex with calcium, magnesium, or other metal ions.

How do you find the concentration of EDTA?

Calculate the concentration of calcium ions in the hard water sample.

  1. Calculate the average titre of EDTA: average titre = (8.76 + 8.80 + 8.78) ÷ 3 = 8.78 mL = 8.78 x 10-3 L.
  2. Calculate the moles of EDTA in the average titre: moles(EDTA) = concentration (mol L-1) x volume (L) = 0.010 x 8.78 x 10-3 = 8.78 x 10-5 mol.