Question

exercise 3. provide the formula for each compound.
nickel (iii) carbonate
calcium nitrate
copper (ii) acetate
potassium phosphate
silver acetate
zinc chromate
tin (ii) nitrate
tin (ii) nitrite
ammonium bicarbonate
copper (ii) sulfite
sodium hydroxide
potassium cyanide
potassium phosphide

Explanation:

To write the formula for each compound, we need to know the charges of the ions involved. For example, nickel (III) has a charge of \(+3\) and carbonate \((CO_3^{2 -})\) has a charge of \(- 2\). Using the criss - cross method (where we take the absolute value of the charge of one ion as the subscript of the other ion), for \(Ni^{3+}\) and \(CO_3^{2 -}\), the formula is \(Ni_2(CO_3)_3\).
Calcium \((Ca^{2+})\) and nitrate \((NO_3^{-})\) give \(Ca(NO_3)_2\) (since \(Ca\) has a \(+2\) charge and \(NO_3\) has a \(-1\) charge).
Copper (II) \((Cu^{2+})\) and acetate \((C_2H_3O_2^{-})\) form \(Cu(C_2H_3O_2)_2\).
Potassium \((K^{+})\) and phosphate \((PO_4^{3 -})\) result in \(K_3PO_4\).
Silver \((Ag^{+})\) and acetate \((C_2H_3O_2^{-})\) give \(AgC_2H_3O_2\).
Zinc \((Zn^{2+})\) and chromate \((CrO_4^{2 -})\) form \(ZnCrO_4\).
Tin (II) \((Sn^{2+})\) and nitrate \((NO_3^{-})\) give \(Sn(NO_3)_2\).
Tin (II) \((Sn^{2+})\) and nitrite \((NO_2^{-})\) form \(Sn(NO_2)_2\).
Ammonium \((NH_4^{+})\) and bicarbonate \((HCO_3^{-})\) give \(NH_4HCO_3\).
Copper (II) \((Cu^{2+})\) and sulfite \((SO_3^{2 -})\) form \(CuSO_3\).
Sodium \((Na^{+})\) and hydroxide \((OH^{-})\) give \(NaOH\).
Potassium \((K^{+})\) and cyanide \((CN^{-})\) form \(KCN\).
Potassium \((K^{+})\) and phosphide \((P^{3 -})\) give \(K_3P\).

Answer:

nickel (III) carbonate: \(Ni_2(CO_3)_3\)
calcium nitrate: \(Ca(NO_3)_2\)
copper (II) acetate: \(Cu(C_2H_3O_2)_2\)
potassium phosphate: \(K_3PO_4\)
silver acetate: \(AgC_2H_3O_2\)
zinc chromate: \(ZnCrO_4\)
tin (II) nitrate: \(Sn(NO_3)_2\)
tin (II) nitrite: \(Sn(NO_2)_2\)
ammonium bicarbonate: \(NH_4HCO_3\)
copper (II) sulfite: \(CuSO_3\)
sodium hydroxide: \(NaOH\)
potassium cyanide: \(KCN\)
potassium phosphide: \(K_3P\)