They are called spectator ions, they are present, but don't participate directly in the reaction. They will no longer appear, when we write the net ionic equation, which includes only the participating species: Pb 2+ (aq) + 2 I-(aq) → PbI 2 (s) Rules for writing net ionic equations: 1. Write the balanced molecular equation. 2.
The following tests for the following cations are fully described including explanations, methods, observations and equations, so described are how to test for positive ions – mainly metal ions: ammonium ion NH 4 +, hydrogen ion/oxonium ion/acids H + /H 3 O +, lithium ion Li +, sodium ion Na +, potassium ion K +, calcium ion Ca 2+, strontium ...
In this reaction Ca is oxidized to Ca 2+ and neutral O 2 is transformed to O 2− ions. When an atom, ion, or molecule becomes more negatively charged (gains electrons), we say that it is reduced . The gain of electrons by a substance is called reduction .
Identify the spectator ion(s) for the reaction of lithium carbonate with copper (II) chloride.