Exercise 5: Philip works for Regeneron and his boss asks him to calculate the hydrogen ion concentration TH•] of a solution at pH 2. Exercise 6: Lisa is a PhD student in Professor Szaro's lab. She is creating a large stock solution of hydrochloric acid for a lab experiment. She has 15 liters of a hydrochloric acid solution at a pH of 3. How many moles of hydrogen ions total are in the solution?
![It's your turn.
Exercise 5: Philip works for Regeneron and his boss asks him to calculate the hydrogen ion concentration
[H+] of a solution at pH 2.
Exercise 6: Lisa is a PhD student in Professor Szaro's lab. She is creating a large stock solution of
hydrochloric acid for a lab experiment. She has 15 liters of a hydrochloric acid solution at a pH of 3. How
many moles of hydrogen ions total are in the solution?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7490fbb1-5db3-4071-8808-1945669f306e%2F1c36615e-d749-49e9-bb53-6c32c56ba6b8%2Flqid6hs_processed.jpeg&w=3840&q=75)
pH is a scale used in chemistry to quantify the acidity or basicity of an aqueous solution. It is previously denoted as "potential of hydrogen" (or "power of hydrogen"). Acidic solutions (those containing a larger concentration of H+ ions) have a lower pH than basic or alkaline solutions. The pH scale is logarithmic, indicating the concentration of hydrogen ions in a solution in inverse order.
![{\displaystyle {\ce {pH}}=-\log(a_{{\ce {H+}}})=-\log[{\ce {H+}}]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/db1bfbccbb74f099fb8eea451e2d1ea088319e85)
At 25 °C, acidic solutions have a pH less than 7, while basic solutions have a pH greater than 7. At this temperature, pH 7 solutions are neutral (e.g. pure water). The pH neutral value changes with temperature, becoming lower than 7 as the temperature rises. For highly strong acids, the pH value can be less than 0 and for very strong bases, it can be larger than 14.
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