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Ch.4 - Reactions in Aqueous Solution
Chapter 4, Problem 113b

The arsenic in a 1.22-g sample of a pesticide was converted to AsO43- by suitable chemical treatment. It was then titrated using Ag+ to form Ag3AsO4 as a precipitate. (b) Name Ag3AsO4 by analogy to the corresponding compound containing phosphorus in place of arsenic.

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Step 1: Identify the corresponding compound containing phosphorus in place of arsenic. In this case, the phosphorus compound would be Ag3PO4.
Step 2: Determine the name of the phosphorus compound. Ag3PO4 is known as silver phosphate.
Step 3: Use the name of the phosphorus compound as a guide to name the arsenic compound. Replace 'phosphate' with 'arsenate' in the name of the phosphorus compound.
Step 4: The name of Ag3AsO4 is therefore silver arsenate.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Nomenclature of Inorganic Compounds

Inorganic nomenclature involves naming compounds based on their chemical composition and structure. For example, the naming of metal salts often follows the pattern of naming the cation first followed by the anion. In this case, Ag<sub>3</sub>AsO<sub>4</sub> can be named by drawing an analogy to similar compounds, such as those containing phosphorus, which helps in understanding the naming conventions.
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Precipitation Reactions

Precipitation reactions occur when two soluble salts react to form an insoluble compound, known as a precipitate. In this scenario, the titration of AsO<sub>4</sub><sup>3-</sup> with Ag<sup>+</sup> leads to the formation of Ag<sub>3</sub>AsO<sub>4</sub>, which precipitates out of solution. Understanding this concept is crucial for predicting the formation of solid products in chemical reactions.
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Stoichiometry in Chemical Reactions

Stoichiometry involves the calculation of reactants and products in chemical reactions based on balanced equations. In the context of the question, knowing the stoichiometric ratios between Ag<sup>+</sup> and AsO<sub>4</sub><sup>3-</sup> is essential for determining the amounts of each substance involved in the titration process. This concept is fundamental for quantifying the results of chemical analyses.
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