post laboratory Can calcium hydroxide solution be used to distinguish Co(NO_3)_2

Question

post laboratory Can calcium hydroxide solution be used to distinguish Co(NO_3)_2 and Fe(NO_3)_3 solutions using only the titration technique prevented in this lab? Justify your answer with an explanation. In Step 32 a student added 150 mL of water to the beaker containing 10 mL of unknown metal nitrate solution instead of 100 mL of water as instructed? Will this experimental error significantly affect the volume of NaOH that must be added in the titration? Justify your answer with an explanation.

Explanation / Answer

A) The reaction between calcium hydroxide and cobalt nitrate is double displacement reaction but with Fe(NO3)3 is not

B) the sample is unknown metal nitrate solution, so this leads dilution of sample which decrease its concentration. this finally leads to methodic error and affect the consumption of volume of NaOH

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