The pH scale was designed to make it convenient to express hydrogen ion concentrations that are small in aqueoussolutions. The definiton of pH is in terms of base 10 logarithms.pH- log [H*]=where H+ is the hydrogen ion concentration.a. If the hydrogen ion concentration in a solution is 2.04 x 10-3 mol/L, the pH isb. If the pH of a solution is 3.495, the hydrogen ion concentration ismol/L.Submit AnswerRetry Entire GroupNo more group attempts remain Radioactive decay can be described by the following equationIn A = In Ao – ktwhere Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is aconstant that is characteristic of the substance.For the radioactive isotope iodine-123, k is 5.21 × 10–2 hours.If the original amount of iodine-123 in a sample is 48.1 mg, how much iodine-123 remains after 13.2 hours have passed?mgSubmit AnswerRetry Entire GroupNo more group attempts remain

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ne pH o

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

The pH scale was designed to make it convenient to express hydrogen ion concentrations that are small in aqueous
solutions. The definiton of pH is in terms of base 10 logarithms.
pH
- log [H*]
=
where H+ is the hydrogen ion concentration.
a. If the hydrogen ion concentration in a solution is 2.04 x 10-3 mol/L, the pH is
b. If the pH of a solution is 3.495, the hydrogen ion concentration is
mol/L.
Submit Answer
Retry Entire Group
No more group attempts remain

Radioactive decay can be described by the following equation
In A = In Ao – kt
where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a
constant that is characteristic of the substance.
For the radioactive isotope iodine-123, k is 5.21 × 10–2 hours.
If the original amount of iodine-123 in a sample is 48.1 mg, how much iodine-123 remains after 13.2 hours have passed?
mg
Submit Answer
Retry Entire Group
No more group attempts remain

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