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1. The mass percentage of chloride ion in a 25.00-mL sample of seawater was determined by titrating the sample with silver nitrate, precipitating silver chloride. It took 42.58 mL of 0.2997 M silver nitrate solution to reach the equivalence point in the titration What is the mass percentage of chloride ion in the seawater if its density is 1.025 g/mL

2. 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.

(a) What is the oxidation state of As in AsO43- ?

(b) Name Ag3AsO4 by analogy to the corresponding compound containing phosphorus in place of arsenic.

(c) If it took 25.0 mL of 0.102 M Ag+ to reach the equivalence point in this titration, what is the mass percentage of arsenic in the pesticide?

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Category:- Chemistry
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