Multiple Choice
Which of the following is the correct chemical formula for sodium chromate?
2
views
3. Chemical Reactions
Naming Ionic Compounds
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is the correct chemical formula for platinum(II) nitrite?
A
Pt(NO_3)_2
B
Pt(NO_2)_2
C
Pt_2(NO_3)_2
D
Pt_2(NO_2)_3
Verified step by step guidance1
Identify the oxidation state of platinum in the compound name. 'Platinum(II)' indicates that platinum has a +2 charge, written as Pt^{2+}.
Determine the correct polyatomic ion for 'nitrite.' Nitrite is NO_2^{-}, while nitrate is NO_3^{-}. Since the problem asks for platinum(II) nitrite, use NO_2^{-}.
Balance the charges between the platinum cation and the nitrite anion to form a neutral compound. Platinum has a +2 charge, and each nitrite ion has a -1 charge, so two nitrite ions are needed to balance one Pt^{2+}.
Write the chemical formula by placing the platinum symbol first, followed by the nitrite ion in parentheses with the appropriate subscript to indicate the number of nitrite ions: Pt(NO_2)_2.
Verify that the formula is neutral overall: (+2) from Pt and 2 × (-1) from NO_2^{-} sum to zero, confirming the correct formula is Pt(NO_2)_2.
2:11mWatch next
Master Ionic Compounds Naming with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Naming Ionic Compounds practice set
Problem sets built by lead tutorsExpert video explanations