In contrast, reactions of acids with bases in water involve proton (H +) transfer from an acid to a base. Oxidation-reduction reactions occur with electron transfer between reagents. Two types of reactions involve transfer of a charged species. Precipitation reactions in nature can account for mineral formation in many cases, such as with undersea vents called “black smokers” that form metal sulfides. Fe 2+(aq) + 2 OH −(aq) → Fe(OH)2(s) Al 3+(aq) + PO 4 3−(aq) → AlPO 4(s) Minerals are water-insoluble compounds. A precipitate will form if a solution containing one of these anions is added to a solution containing a metal cation such as Fe 2+, Cu 2+, or Al 3+. The solid that separates is called a precipitate.Ĭompounds having anions such as sulfide (S 2−), hydroxide (OH −), carbonate (CO 3 2−), and phosphate (PO 4 3−) are often insoluble in water. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!įormation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion).Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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