The Insoluble Substance is Barium Nitrate
BANO4
Solubility rules for chromate (CrO₄²⁻) are all chromate are insoluble, except for ions group 1 (Li⁺, Na⁺, K⁺). So soluble chromate are
Li₂CrO₄
Na₂CrO₄
K₂CrO₄
Potassium chromate K₂CrO₄ is soluble.
A substance is said to be insoluble if it doesn't change when placed in water.
When introduced to water, soluble compounds typically form one continuous phase (eg when salt is added to water).
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