This percentage is different for each chemical compound.
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Yes, they do react, to form Sodium sulfate and Water
When sodium hydroxide and sodium sulfate react, they form sodium sulfate and water. The chemical equation for this reaction is: 2 NaOH + Na2SO4 -> 2 Na2SO4 + H2O.
A hydrate is represented by writing the formula of the compound followed by a dot and the number of water molecules associated with the compound. For example, CuSO4 • 5H2O represents copper(II) sulfate pentahydrate, which contains five water molecules for every one copper sulfate molecule.
Not quite! In chemistry, a hydrate is a compound that has water molecules bound to it in a specific ratio. For example, copper sulfate pentahydrate is a compound with five water molecules bound to each copper sulfate molecule.
A simple definition is: hydrate is a substance containing linked to the molecule water molecules. Example: mangnesium sulfate heptahydrate - MgSO4.H2O.