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- If a solution has a lower concentration of hydronium ions than pure water, it has a pH higher than 7. A solution with a pH higher than 7 is called a base Bases, such as baking soda, have a bitter taste.
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Summary. A solution is a mixture of two or more substances that has the same composition throughout. Some solutions are acids, some are bases. Pure water has a pH of 7, so the point of neutrality on the pH scale is 7. Acids have a higher concentration of hydronium ions than pure water, and a pH lower than 7.
Define acidity. Explain how acidity is measured. Compare and contrast acids and bases. Hydrochloric acid is secreted by the stomach to provide an acidic environment for the enzyme pepsin. What is the pH of this acid? How strong of an acid is it compared with other acids? Define an ion.
- Christine Miller
- 2020
Learning Outcomes. Identify the characteristics of acids. Identify the characteristics of bases. The pH of a solution indicates its acidity or alkalinity. H2O(I) H+(aq)+OH−(aq) H 2 O ( I) H + ( a q) + OH − ( a q) Litmus or pH paper is filter paper that has been treated with a natural water-soluble dye so it can be used as a pH indicator, to ...
- Overview
- About this unit
- Hydrogen bonding in water
- Cohesion and adhesion
- Temperature and state changes in water
- Acids, bases, and pH
About this unit
This unit is part of the Biology library. Browse videos, articles, and exercises by topic.
Hydrogen bonding in water
Water is key to life, and hydrogen bonding is key to understanding water! Learn how the structure of water and the properties of O and H atoms allow water molecules to "stick" to each other via hydrogen bonds, as well as why water makes a great solvent (why you can dissolve stuff in it so well).
This unit is part of the Biology library. Browse videos, articles, and exercises by topic.
Water is key to life, and hydrogen bonding is key to understanding water! Learn how the structure of water and the properties of O and H atoms allow water molecules to "stick" to each other via hydrogen bonds, as well as why water makes a great solvent (why you can dissolve stuff in it so well).
Water molecules like to stick together! Learn more about the cohesive (and adhesive) properties of water and why they're important for bugs, trees, and the tear ducts in your eyes!
Ever wonder why sweating cools you off? Or why ice cubes float in a glass? If so, you're in the right place! Learn about what happens to water when it heats up, cools down, and changes state (becoming a solid or a gas). We'll see why water is great at resisting changes in temperature, and why ice is less dense than liquid water.
You may know that lemon juice is acidic, and that bleach is basic. But did you know that acid-base chemistry is happening all the time in your body? Learn what makes something an acid or base, what the pH scale really measures, and how buffers work in your blood!
Thus, small changes in pH represent large changes in the concentrations of hydrogen ions. Pure water is neutral. It is neither acidic nor basic, and has a pH of 7.0. Anything below 7.0 (ranging from 0.0 to 6.9) is acidic, and anything above 7.0 (from 7.1 to 14.0) is alkaline (basic).
Study Guides. Biology. Acids and Bases. Acids are chemical compounds that release hydrogen ions (H+) when placed in water. For example, when hydrogen chloride is placed in water, it releases its hydrogen ions and the solution becomes hydrochloric acid. Bases are chemical compounds that attract hydrogen atoms when they are placed in water.
A base is a molecule or ion able to accept a hydrogen ion from an acid. Acidic substances are usually identified by their sour taste. An acid is basically a molecule which can donate an H + ion and can remain energetically favourable after a loss of H +. Acids are known to turn blue litmus red.
