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Historically, as written in older chemistry papers, pH stands for "potential of Hydrogen" (some sources say it might have been "potenz" or "power of Hydrogen" or "pondus or quantity of hydrogen")—but what does that actually mean? What do we use this for?

pH is a way to measure the relative strengths of acids and bases. We start this video with a quick review of the definition of acid and base, consider whether water is an acid or a base, and then work 3 examples of using the equation for pH. It's a base 10 logarithmic scale, where something with pH 5 is 10 times more acidic than something with pH 6. pH7 is neutral, and anything with a pH greater than 7 is considered basic (or alkaline), and anything with a pH less than 7 is considered acidic. Make sure to watch to the end so you can see the surprising pH of some of our everyday liquids!

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LESSON CHAPTERS:
0:00 What is pH?
0:12 Arrhenius definition of an acid - aqueous solutions
1:19 The pH scale
0:42 Bronsted-Lowry definition - doesn't have to be aqueous
1:45 The equation to calculate pH
2:11 Is water an acid or a base?
3:43 The pH scale (0-14)
4:47 pH is a negative logarithmic scale
5:29 Example 1 - lemon juice
6:37 Example 2 - laundry detergent
7:34 Example 3 - soda
8:04 The pH of common liquids

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Written and Produced by Kimberly Hatch Harrison

About our instructor:
Kimberly Hatch Harrison received degrees in Biology and English Literature from Caltech before working in pharmaceuticals research, developing drugs for autoimmune disorders. She continued her studies in Molecular Biology (focusing on Immunology and Neurobiology) at Princeton University, where she began teaching as a graduate student. Her success in teaching convinced her to leave the glamorous world of biology research and turn to teaching full-time, accepting a position at an exclusive prep school, where she taught biology and chemistry for eight years. Kimberly co-founded Socratica Studios.

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#Chemistry #pH #EducationalVideo