4. a. Read over Procedure Part B and briefly describe what a titration is and ho

Question

4. a. Read over Procedure Part B and briefly describe what a titration is and how you will be conducting your titration in this experiment (i.e., what indicator, acid, and base will be used and what color/pH change will be observed for the endpoint). Describe the indicator color at the beginning of the titration and how you will detect the endpoint for the titration b. u erazr a 1513 ml ampi f H to e equivalence point. a. How many moles of NaOH were used? b. How many moles of HCl were present at the start? c. What was the concentration of the HCI?

Explanation / Answer

5.

a) In 1000 mL 1 (M) solution of NaOH the number of moles=1

So,by unitary method in 13.34 mL of 0.09564 (M) solution of NaOH number of moles = (13.34*0.09564)/1000 = 1.28*10-3 moles

Say concentration of HCl= 'S' molar

So, in 1000 mL of S molar HCl solution number of moles=S

In 15.13 mL of the S molar HCl solution the number of moles = (15.13*S)/1000

Now at equivalence point,

Number of moles of HCl = Number moles of NaOH

( S*15.13)/1000=1.28*10-3

S= 0.08

So at the concentration of HCl=0.08 (M)

At the starting in 15.13 mL of 0.08 (M) solution of HCl,the number of moles=(0.08*15.13)/1000

= 1.21*10-3 moles

c) It is shown before that initial concentration of HCl=0.08 (M)

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