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A downward arrow after a formula, marking a solid falling out of solution.
Also known as: Down arrow chemistry, Precipitation arrow
A downward arrow after a formula means that product leaves the solution as a solid. Its upward twin means a gas escapes — the direction is a picture of where the substance physically goes.
Marks a product that leaves the solution as an insoluble solid.
Contexts: Laboratory
Is mirrored by an upward arrow marking a product that leaves as a gas, so the direction of the arrow pictures where the substance physically goes.
Contexts: Laboratory
Is an alternative to the state symbol (s) written after the formula, which states the same thing in words.
Contexts: Laboratory
A short vertical arrow pointing downward, set immediately after a chemical formula on the same line.
Solid leaving downward against gas leaving upward.