OmniLab Guided chemistry

For chemistry students · 3 minute read

What formula forms from sodium and chlorine?

The formula is NaCl. Sodium forms Na⁺ and chlorine forms Cl⁻, so one ion of each gives an electrically neutral formula unit.

Try Sodium + Chlorine

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Formula and reaction

Na⁺ + Cl⁻ → NaCl

For the elemental reaction, balance chlorine as Cl₂: 2Na(s) + Cl₂(g) → 2NaCl(s).

Worked explanation

Build the formula from the charges

Use this as a study aid, then compare it with your course materials.

  1. 01

    Write the ions

    Sodium is a group 1 metal and forms Na⁺. Chlorine accepts an electron and forms the chloride ion, Cl⁻.

  2. 02

    Make the charge total zero

    A +1 sodium ion and a −1 chloride ion balance in a 1:1 ratio. No subscripts are needed in NaCl.

  3. 03

    Use formula-unit language

    Solid sodium chloride is a repeating ionic lattice, so NaCl describes its simplest ion ratio rather than one discrete molecule.

In the virtual lab

Use the lab to connect formula and equation

  • The compounds matrix starts with Na + Cl₂.
  • The returned equation should use only the selected reactants.
  • Check the generated explanation against your course materials.