### pH scale

Posted:

**Tue Dec 04, 2018 7:21 pm**This part is a little confusing for me. If, basic solutions have less H3O+ than acids, and the pH log measures the amount of H3O+, then why do the larger numbers (8-14) correspond to bases?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=60&t=38400

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Posted: **Tue Dec 04, 2018 7:21 pm**

This part is a little confusing for me. If, basic solutions have less H3O+ than acids, and the pH log measures the amount of H3O+, then why do the larger numbers (8-14) correspond to bases?

Posted: **Tue Dec 04, 2018 7:28 pm**

rikolivares wrote:This part is a little confusing for me. If, basic solutions have less H3O+ than acids, and the pH log measures the amount of H3O+, then why do the larger numbers (8-14) correspond to bases?

pH = -log

With this knowledge, the pH of a number like 10

10

Posted: **Tue Dec 04, 2018 7:29 pm**

pH of 8-14 would have an H30+ concentration of (10^-8) mol/L to (10^-14) mol/L. This shows that larger pH numbers mean there are less H30+ due to the negative power of 10.