Analytical Chemistry T5-8

How many sites on the ethylenediaminetetraacetic acid can form dative covalent bonds with the metal ion?

• 2

• 4

• 6

• None of the above

What is the name of the reagent that causes a chemical species to reduce?

• Oxidising agent

• Analytical agent

• Reducing agent

• Precipitating agent

Which element is reduced in the following equation:

Ca + H₂O → CaO + H₂

• H₂O

• Ca

• O

• H₂

What is the pH of the buffer solution used in the EDTA based titration?

• 8

• 9

• 10

• 11

What is the colour change of Eriochrome Black T in EDTA titration?

• Red to blue

• Black to green

• Purple to black

• Blue to purple

Which process happens when S turns to SO₄^2-?

• Oxidizing agent

• Oxidation

• Reducing agent

• Reduction

Which of the following statements represents the precipitation titration curves EXCEPT for?

• The change in concentration of reactants throughout titration

• The increase in concentration of reactants throughout titration

• Titration error that is likely to occur when using the indicators

• The conditions at equivalence point

Which of these is the correct way to calculate Q, given that:

PbI₂ (s) ⇆ Pb²⁺ + 2I^-

• Q = [Pb²⁺] 2[I^-]

• Q = 2[Pb²⁺][I^-]²

• Q = [Pb]²⁺ [I^-]²

• Q = [Pb²⁺] [I^-]²

Which of the following is a type of particle size?

• A. Colloidal

• B. Crystalline

• C. Both A and B

• D. Neither A nor B

What does a desiccant do in the Precipitation Method?

• Further wets the precipitate

• Further dries the precipitate

• Further moistens the precipitate

• All of the above