Write the formula for each of the following compounds.
(a) Diamminesilver(I) nitrate
(b) Potassium diaquadioxalatocobaltate(III)

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Identify the components of each compound and their charges.

For (a) Diamminesilver(I) nitrate: Recognize that 'Diamminesilver(I)' indicates a complex ion with silver (Ag) coordinated to two ammonia (NH₃) ligands, and 'nitrate' is the NO₃⁻ ion.

Write the formula for the complex ion in (a): [Ag(NH₃)₂]⁺, and combine it with the nitrate ion to form the compound: [Ag(NH₃)₂]NO₃.

For (b) Potassium diaquadioxalatocobaltate(III): 'Diaquadioxalatocobaltate(III)' indicates a complex ion with cobalt (Co) in the +3 oxidation state, coordinated to two water (H₂O) molecules and two oxalate (C₂O₄²⁻) ions.

Write the formula for the complex ion in (b): [Co(H₂O)₂(C₂O₄)₂]⁻, and combine it with potassium (K⁺) to form the compound: K₃[Co(H₂O)₂(C₂O₄)₂].

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