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# : Using modern analytical techniques, it is possible to ISBN: 9780321809247 1

## Solution for problem 100AE Chapter 4

Chemistry: A Molecular Approach | 3rd Edition

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Problem 100AE

100AE: Using modern analytical techniques, it is possible to detect sodium ions in concentrations as low as 50 pg/mL. What is this detection limit expressed in (a) molarity of Na+, (b) the number of Na+ ions per cubic centimeter of solution, (c) the mass of sodium per 1000 L of solution?

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Solution 100AE: Solution: Here, we are going to find the detection limit expressed in molarity of sodium ion. Also, we are going to calculate the number of sodium ions per cubic centimeter of solution and the mass of sodium per 1000 L of solution. Step1: Given, lowest detectable concentration of sodium ions = 50 pg/mL So, volume of the solution in its lowest detectable concentration = 1 mL 1 = 1000 L = 0.001 L Mass of the sodium ion in its lowest detectable concentration = 50 pg = 50 x 10 -12g [1 pg = 10 -12g] Molar mass of sodium ion = 23.0 g/mol Number of moles of sodium ion in its lowest detectable concentration = mass of sodium ion molar mass = ( 50 x 10 -12) / 23.0 -12 = 2.17 x 10 mol. Step2: number of moles of sodium ion a) Therefore, molarity of the sodium ion solution = volume of solution in litres = (2.17 x 10 -12mol) / 0.001 L -9 = 2.17 x 10 M Step3: Number of moles of sodium ion per litre of solution = 2.17 x 10 mol. -9 Therefore,...

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##### ISBN: 9780321809247

This textbook survival guide was created for the textbook: Chemistry: A Molecular Approach, edition: 3. The full step-by-step solution to problem: 100AE from chapter: 4 was answered by , our top Chemistry solution expert on 02/22/17, 04:35PM. The answer to “100AE: Using modern analytical techniques, it is possible to detect sodium ions in concentrations as low as 50 pg/mL. What is this detection limit expressed in (a) molarity of Na+, (b) the number of Na+ ions per cubic centimeter of solution, (c) the mass of sodium per 1000 L of solution?” is broken down into a number of easy to follow steps, and 51 words. This full solution covers the following key subjects: ions, solution, sodium, Limit, detect. This expansive textbook survival guide covers 82 chapters, and 9454 solutions. Since the solution to 100AE from 4 chapter was answered, more than 460 students have viewed the full step-by-step answer. Chemistry: A Molecular Approach was written by and is associated to the ISBN: 9780321809247.

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