3ni2+(aq)+2co(s)⟶2co3+(aq)+3ni(s) which substance gets oxidized?

Co⁰ - 3e⁻ → Co³⁺ (cobalt loses electrons so it is oxidized)

Explanation:

When a substance is oxidized it means that it loses electrons.

When a substance is reduced it means that it gains electrons.

Ni²⁺ + 2e⁻ → Ni⁰ (nickel gains electrons so it is reduced)

Co⁰ - 3e⁻ → Co³⁺ (cobalt loses electrons so it is oxidized)

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when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.