Question

write the formula of each polyatomic ionic compound shown below:

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name
chemical formula
ammonium cyanide
strontium chlorate
lithium phosphite
aluminum carbonate
potassium nitrate

Explanation:

Step1: Determine the ions

• Ammonium ion: \(NH_4^+\), cyanide ion: \(CN^-\)
• Strontium ion: \(Sr^{2+}\), chlorate ion: \(ClO_3^-\)
• Lithium ion: \(Li^+\), phosphite ion: \(PO_3^{3 -}\)
• Aluminum ion: \(Al^{3+}\), carbonate ion: \(CO_3^{2 -}\)
• Potassium ion: \(K^+\), nitrate ion: \(NO_3^-\)

Step2: Balance the charges

• For ammonium cyanide: \(1\times(+ 1)+1\times(-1) = 0\), formula: \(NH_4CN\)
• For strontium chlorate: \(1\times(+2)+2\times(-1)=0\), formula: \(Sr(ClO_3)_2\)
• For lithium phosphite: \(3\times(+1)+1\times(-3) = 0\), formula: \(Li_3PO_3\)
• For aluminum carbonate: \(2\times(+3)+3\times(-2)=0\), formula: \(Al_2(CO_3)_3\)
• For potassium nitrate: \(1\times(+1)+1\times(-1)=0\), formula: \(KNO_3\)

Answer:

Name	Chemical Formula
Strontium chlorate	\(Sr(ClO_3)_2\)
Lithium phosphite	\(Li_3PO_3\)
Aluminum carbonate	\(Al_2(CO_3)_3\)
Potassium nitrate	\(KNO_3\)