Chemistry help needed: How do I find the concentration of NaOH added?

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I am doing a precipitation titration of cobalt chloride, How do I find the concentration of NaOH added? 

The volume of NaOH  was 18.03mL and the volume of CoCl2 was 38.13 mL, How would I find the concentration?

Nov 9th, 2015

Thank you for the opportunity to help you with your question!

The equation for the chemical reaction between cobalt chloride and sodium hydroxide is:
CoCl2 (aq) + 2NaOH (aq) → 2NaCl (aq) + Co(OH)2 (s)

To find the concentration in terms of molarity add the total volume =18.03mL+38.13mL =56.16mL

Now,To find the concentration of NaOH added ,you should have taken the definite weight of NaOH in the experiment.

Suppose the weight of NaOH taken =x gram.

From the given weight ,determine the mole of NaOH =weight taken/Molecular weight =x/40 mole

Now the concentration of NaOH is expressed in mol/liter

Volume of the solution is 56.16mL =56.16/1000 L=.05616L

Concentration of NaOH =

Here substitute the value of weight taken in the experiment to determine the concentration of NaOH.


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Nov 9th, 2015

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