Polyatomic Ions and Compound Formulae

Table 3.7: Common Polyatomic Ions and Their Properties * Ammonium * Chemical Formula: $NH^+$ $4$ * Valency: $1$ * Hydronium * Chemical Formula: $H_2O^+$ * Valency: $1$ * Nitrate * Chemical Formula: $NO_{12}$ * Valency: $1$ * Hydrogencarbonate (Bicarbonate) * Chemical Formula: $HCO_3$ * Valency: $1$ * Hydroxide * Chemical Formula: $OH$ * Valency: $1$ * Permanganate * Chemical Formula: $MnO_4$ * Valency: $1$ * Hydrogensulphate (Bisulphate) * Chemical Formula: $HSO$ * Valency: $1$ * Chromate * Chemical Formula: $CrO^{2-}$ * Valency: $2$ * Dichromate * Chemical Formula: $Cr_2O,^{2-}$ * Valency: $2$ * Sulphate * Chemical Formula: $SO^{2-}$ * Valency: $2$ * Carbonate * Chemical Formula: $CO_3^{2-}$ * Valency: $2$ * Phosphate * Chemical Formula: $PO^{3-}$ * Valency: $3$

Sodium Nitrate * Constituent Ions: $Na^+$ and $NO$ * Valency of Sodium ( $Na$ ): $1$ * Valency of Nitrate ( $NO$ ): $1$ * Formula Intermediate: $NaNO_{12}$ * Final Chemical Formula: $NaNO_3$
Potassium Carbonate * Constituent Ions: $K^+$ and $CO_3^{2-}$ * Valency of Potassium ( $K$ ): $1$ * Valency of Carbonate ( $CO_3$ ): $2$ * Final Chemical Formula: $K_2CO_3$
Magnesium Nitrate * Constituent Ions: $Mg^{2+}$ and $NO,$
Ammonium Phosphate * (The transcript concludes with the mention of this compound as an example).