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# Technetium-99 has been used as a radiographic agent in bone scans ( Tc is absorbed by ISBN: 9781439049402 426

## Solution for problem 42 Chapter 19

Introductory Chemistry: A Foundation | 7th Edition

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Problem 42

Technetium-99 has been used as a radiographic agent in bone scans ( Tc is absorbed by bones). If Tc has a half-life of 6.0 hours, what fraction of an administered dose of 100 g of Tc remains in a patients body after 2.0 days?

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Acids and Bases, advanced You can’t take quantitative analysis chemistry without having taken intro chemistry, so I’m assuming that you’ve been introduced to the concept of acids and bases and pH. You were probably taught to calculate the pH of an acidic solution as –log(acid concentration). This works just fine, until we make up a solution of 10^-8 M HCl and you are asked to calculate the pH. –log(10^-8) = 8, but a pH of 8 means that you have a basic solution. This is obviously not the case, seeing as your solution consists of water and hydrochloric acid! Where did we go wrong Water can auto-ionize, K=10^-14. As you can see from the very small K value, the auto-ionization of water has a very slight effect on pH (especially if there are other, stronger, acids and bases in solution),

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##### ISBN: 9781439049402

The full step-by-step solution to problem: 42 from chapter: 19 was answered by , our top Chemistry solution expert on 03/14/18, 08:03PM. This full solution covers the following key subjects: . This expansive textbook survival guide covers 21 chapters, and 2203 solutions. Since the solution to 42 from 19 chapter was answered, more than 282 students have viewed the full step-by-step answer. Introductory Chemistry: A Foundation was written by and is associated to the ISBN: 9781439049402. This textbook survival guide was created for the textbook: Introductory Chemistry: A Foundation, edition: 7. The answer to “Technetium-99 has been used as a radiographic agent in bone scans ( Tc is absorbed by bones). If Tc has a half-life of 6.0 hours, what fraction of an administered dose of 100 g of Tc remains in a patients body after 2.0 days?” is broken down into a number of easy to follow steps, and 44 words.

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