Salinity is the measurement of the amount of dissolved solids in water. There are many different types of solids dissolved in water, but the most common dissolved solid is sodium chloride (NaCl). Dissolved solids are often called salts. Salinity exerts profound impacts on the marine environment. It controls the density dependent movement of water and it affects the distribution of plants and animals. A shrimp farm will be opened and as a scientist, you need to identify the salinity in the brackish in order to determine the suitability of this farm. (a) The scientist transferred 10mL of brackish water sample to a tall biker and added 0.5mL concentrated nitric acid and 200mL of deionized water. Then, silver nitrate solution (0.1M) was added dropwise from the burette with constant stirring until coagulation of the precipitate began to occur. The suspension was heated to boiling and stirred for 5 min. A few drops of silver nitrate solution added to conform completeness of precipitation. The suspension was allowed to cool in the dark place for 30 min and then filter through a reweighed sintered crucible glass (porosity 4). Next, using 3 mL nitric acid solution (2M) dissolved in 300mL of deionized water for transfer and washing. Finally, the precipitate and crucible were dried in oven at 60oC to constant weight to yield silver chloride (0.8329g). According to the steps mention, describe the 8 steps of a Gravimetric analysis. (b) According to Q.2 (a), calculate the salinity of the brackish in percent composition by weight of the analyte in the sample of NaCl. Given MWNaCl = 58.44 g/mol, MWAg NO3 = 169.87 g/mol and MWAgCl = 143.32 g/mol

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter2: Chemical Compounds

Section: Chapter Questions

Problem 105QRT

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Question 2 Salinity is the measurement of the amount of dissolved solids in water. There are many different types of solids dissolved in water, but the most common dissolved solid is sodium chloride (NaCl). Dissolved solids are often called salts. Salinity exerts profound impacts on the marine environment. It controls the density dependent movement of water and it affects the distribution of plants and animals. A shrimp farm will be opened and as a scientist, you need to identify the salinity in the brackish in order to determine the suitability of this farm. (a) The scientist transferred 10mL of brackish water sample to a tall biker and added 0.5mL concentrated nitric acid and 200mL of deionized water. Then, silver nitrate solution (0.1M) was added dropwise from the burette with constant stirring until coagulation of the precipitate began to occur. The suspension was heated to boiling and stirred for 5 min. A few drops of silver nitrate solution added to conform completeness of precipitation. The suspension was allowed to cool in the dark place for 30 min and then filter through a reweighed sintered crucible glass (porosity 4). Next, using 3 mL nitric acid solution (2M) dissolved in 300mL of deionized water for transfer and washing. Finally, the precipitate and crucible were dried in oven at 60oC to constant weight to yield silver chloride (0.8329g). According to the steps mention, describe the 8 steps of a Gravimetric analysis. (b) According to Q.2 (a), calculate the salinity of the brackish in percent composition by weight of the analyte in the sample of NaCl. Given MWNaCl = 58.44 g/mol, MWAg NO3 = 169.87 g/mol and MWAgCl = 143.32 g/mol

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