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An unknown 0.0500 M metal nitrate solution is either cobalt(II) nitrate or iron(III) nitrate. Both react with NaOH to form insoluble metal hydroxides. 10.00 mL of the 0.0500 M metal nitrate solution is titrated with 0.100 M NaOH solution. It took 15.1 mL to reach the equivalence point. 

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