Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 15 - Acids and Bases - Questions & Problems: 15.13

Answer

- No, it's not possible to conclude that the solution is acidic. - It's necessary to know the temperature of the solution. - Yes, it can be zero or negative. - $HCl: 1.00 M --> pH = 0$ - $HCl: 10.00M --> pH = -1$

Work Step by Step

- The $K_w$ variates with the change of temperature, the value $10^{-14}$ is used for $25^{\circ}C$. Therefore, if the temperature changes, the value of neutral pH also changes, so we don't know if $6.7$ is higher, lower or equal to this value, and we can't conclude that the solution is acidic. - Let's use the formula: $[H^+] = 10^{-pH} $ If pH = 0: $[H^+] = 10^{0} = 1M$ - Therefore, if we use a $1.00M$ strong acid solution, its pH will be 0. If pH < 0 Let's use (-1) as an example. $[H^+] = 10^{-(-1)} = 10^1 = 10M$ - If we use a 10.00M strong acid solution, the pH will be less than 0.
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