Titration

A titration is an experimental technique used to determine the concentration of an unknown solution.

Example 1.

Mike the Mighty Chemist wants to determine the concentration of a Sodium Hydroxide sample so he does a titration with HCl. He gathers the following data. Use this information to determine [NaOH]

NaOH Samples = 10.00mL     [HCl] = 0.75M

Trial                                 1        2           3         4
Final Reading (mL)       13.3       26.0      38.8    13.4
Initiating Reading (mL)  0.2         13.3      26.0    0.60
Volume Used (mL)       13.1       12.7     12.8      12.8

So you're first step would to make a balanced equation. (Of course)

Our balanced equation would be...

NaOH + HCl  -->   HOH   +  NaCl

Since the formula is already balanced, would wouldn't have to put any numbers in front of the compounds.

We would have to gather the average between all of the Volume used, but you have to use the ones that are near each other. (12.7, 12.8 and 12.8) because 13.1 is a bit far off from those numbers. Since you know the average of the Volume which is, 12.85mL, you would want to convert that into L because you can't do anything when your volume is in mL while your equation is in L.

0.750mol/L x 0.01285L = 0.00964mol of HCl

Now you would want to use the ratio of WHAT YOU NEED OVER WHAT YOU HAVE. 


0.00964mol of HCl x 1 NaOH/ 1HCl = 0.00964mol of NaOH

Now, do you remember the NaOH samples that's in mL? Well, now you would want to convert that into L too so that you can finish your equation up.

So since it's 10.00 mL it would become 0.0100L. Now you can finish your equation!

0.00964mol x 1 / 0.0100L = 0.96mol/L

-Meldrick Mendoza