ALL pH Flashcards
What does pH stand for?
Potential of Hydrogen.
What is the pH scale range?
0 to 14.
True or False: A pH of 7 is considered neutral.
True.
What is the pH of pure water at 25°C?
7.
Fill in the blank: A solution with a pH less than 7 is considered _____ .
acidic.
Fill in the blank: A solution with a pH greater than 7 is considered _____ .
basic (or alkaline).
Which ion concentration is measured by pH?
Hydrogen ions (H+).
What is the formula to calculate pH?
pH = -log[H+].
What is the relationship between pH and hydrogen ion concentration?
As pH decreases, hydrogen ion concentration increases.
True or False: Strong acids have a higher pH than weak acids.
False.
What is the pH of lemon juice?
Approximately 2.
What is the pH of household ammonia?
Approximately 11.
Multiple Choice: Which of the following is a strong acid? A) Vinegar B) Hydrochloric Acid C) Baking Soda
B) Hydrochloric Acid.
What pH range is typically considered safe for aquatic life?
6.5 to 9.
Fill in the blank: The pH of human blood is typically maintained between _____ .
7.35 and 7.45.
What type of solution is formed when an acid and a base react?
A salt and water.
True or False: pH indicators are substances that change color depending on the pH of a solution.
True.
What is a common pH indicator?
Litmus paper.
Multiple Choice: Which of the following has the lowest pH? A) Coffee B) Milk C) Drain Cleaner
A) Coffee.
What effect does temperature have on pH?
pH can change with temperature due to the dissociation of water.
Fill in the blank: The term _____ refers to the ability of a solution to resist changes in pH.
buffering capacity.
True or False: All living organisms can survive in any pH environment.
False.
What is the pH of gastric acid?
Approximately 1.5 to 3.5.
What does a pH meter measure?
The voltage difference between two electrodes in a solution.
