This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here are the observations and inferences for the tests on solid M: a) Place all of the solid in a boiling tube. Add about 10 cm^3 of distilled water and shake thoroughly. Filter the mixture into another boiling tube. Retain the residue for test (2b) below. | Observations | Inferences | | :------------------------------------------------------------------------ | :----------------------------------------------------------------------------------------------------- | | Solid M partially dissolves to form a colorless solution. A white residue remains. | Solid M contains a water-soluble component and a water-insoluble component. The soluble component is a colorless salt. | i) To a portion of the filtrate obtained in (a) above, add 2M sodium hydroxide drop wise until excess. | Observations | Inferences | | :------------------------------------------------------------------------ | :---------------------------------------------------------------------- | | A white precipitate forms. The precipitate dissolves in excess NaOH to form a colorless solution. | Al^3+, Pb^2+, or Zn^2+ ions are present in the filtrate. | ii) To another portion of the filtrate, add ammonia solution drop wise until excess. | Observations | Inferences | | :------------------------------------------------------------------------ | :---------------------------------------------------------------------- | | A white precipitate forms. The precipitate dissolves in excess ammonia solution to form a colorless solution. | Zn^2+ ions are present in the filtrate. |