No lab not 2. Suppose you had to titrate a solution of NaOH of unknown concentra

Question

No lab not 2. Suppose you had to titrate a solution of NaOH of unknown concentration with a solution of HC of known concentration using phenolphthalein as an indicator. How will you determine the color change? 3. Suppose you titrated a sample of acetic acid (monoprotic acid) with a 0.125 M solution of NaOH. Given the data in the table below, what is the concentration of the acetic acid solution? volume of 0.125 M NaOH dispensed volume of acetic acid solution used volume of water added to the HCl solution 22.40 mL 15.00 mL 15.00 mL 244 WORDS POWERED BY TIN YMCE

Explanation / Answer

Ans 2 :

In the titration procedure of NaOH with HCl . HCl is present in the Erlenmeyer flask ,and NaOH is dropped from the buret. Both the solutions react with each other on 1:1 basis.

HCl reacts with NaOH to form a soluble salt NaCl , (sodium chloride). The presence of phenolphthalein in the mixture gives pink colour on the completion of reaction .

The titration is stopped at the first sight of pink color , before the pink color becomes more saturated.

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