Question

What is the net ionic equation for the reaction between CoCl2 and an alkali hydroxide?
A.Co2+(aq) + 2OH-(aq)  Co(OH)2(s)
B.Na+(aq) + Cl-(aq)  NaCl(s)
C.Co3+(aq) + 3OH-(aq)  Co(OH)3(s)
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Answer 1

The net ionic equation is;Co^2+(aq) +  2OH^-(aq) -------> Co(OH)2(s)

Let the alkali hydroxide be X

The molecular equation is;

CoCl2(aq) + 2XOH(aq) ------> Co(OH)2(s) + 2XCl(aq)

We can now deduce the complete ionic equation as follows;

Co^2+(aq) + 2Cl^-(aq) + 2X^+(aq) + 2OH^-(aq) -------> Co(OH)2(s) + 2X^+(aq) +  2Cl^-(aq)

The net ionic equation will now be;

Co^2+(aq) +  2OH^-(aq) -------> Co(OH)2(s)

Notice that the net ionic equation does not include the spectator ions which are X^+ and Cl^-.

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