Descriptive inorganic chemistry UE Past Papers Questions.

The combination of ligand(s) with a metal cation is often called a coordination complex.

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  is not an amphoteric hydroxide, while is an amphoteric hydroxide.

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An amphoteric substance is one that can behave as a Lewis base and a Bronstead acid.

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The presence of a transition metal in a complex often leads to highly coloured complexes.

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Determination of total alkalinity in the given sample water from the Indian Ocean

Procedure:

1. 30cm³ of water sample water from the Indian Ocean was pipetted into the 250 cm³ conical flask.
2. Three drops of phenolphthalein indicator solution was added to the conical flask. The colour of the solution changed to pink.
3. Then the sample was titrated against 0.02N sulphuric acid solution till the pink colour changed to colourless,
4. To the same solution in the conical flask, three drops of the mixed indicator solution was added, the colour of the solution changed to blue colour.
5. The water sample from the Indian Ocean was then titrated against 0.02 N sulphuric acid solution till the solution changed to yellow.

Answer questions number (i) - (iii) provided below

Calculate

1. Concentration of hydroxide ion (OH^-) in milligram per dm³. present in the water sample from the Indian Ocean.
2. Concentration of carbonate ion and bicarbonate ion and in milligram per dm³ present in the water sample from the Indian Ocean.
3. Total alkalinity of the water from the Indian Ocean in milligram per litre.

Answer / Solution

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