Significance of CO3 in Na2CO3
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Molecular compounds are made up of molecules, while ionic compounds are made up of ions. Ions are
different from molecules, as they have a charge. In an ionic compound, the number of positively
charged cations and negatively charged anions are such that charges are balanced. For example, in the
diagram below, note that there are two sodium cations (+1) to balance the charge of each carbonate
anion (-2).
Many ionic compounds dissolve in water; many do not. If an ionic compound dissolves in water, it
separates into individual charged ions. For example, when the soluble compound sodium carbonate
dissolves in water, the partial negatively charged side of the polar water molecules surround the
positively charged sodium ions, while the partial positively charged side of the polar water molecules
surround the negatively charged carbonate ions. The resulting solution is composed of separate
sodium ions and carbonate ions surrounded by water molecules.
Molecular compounds are made up of molecules, while ionic compounds are made up of ions. Ions are
different from molecules, as they have a charge. In an ionic compound, the number of positively
charged cations and negatively charged anions are such that charges are balanced. For example, in the
diagram below, note that there are two sodium cations (+1) to balance the charge of each carbonate
anion (-2).
Many ionic compounds dissolve in water; many do not. If an ionic compound dissolves in water, it
separates into individual charged ions. For example, when the soluble compound sodium carbonate
dissolves in water, the partial negatively charged side of the polar water molecules surround the
positively charged sodium ions, while the partial positively charged side of the polar water molecules
surround the negatively charged carbonate ions. The resulting solution is composed of separate
sodium ions and carbonate ions surrounded by water molecules.
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