Bromophenol blue is another common acid-base indicator which changes color from yellow in acidic solution to blue in basic solution. The pH values for this indicator are in a range of approximately 3 to 4.6. Instead of using phenolphthalein in the CH3COOH-NaOH titration, if bromophenol blue was used, would the calculated molarity of acetic acid be high, low, or the same?​

Respuesta :

Explanation:

As bromophenol works in the range in the pH range of 3.0 to 4.6 and phenolphthalein works in th epH range of approximately 7.0.

So, when bromophenol is used during titration then volume consumption of base would be less as the end point will come early due to low pH range.

It is known that molarity is the number of moles present in liter of solution.

Mathematically,    Molarity = [tex]\frac{\text{no. of moles}}{\text{volume in liter}}[/tex]

                               = [tex]\frac{n}{\text{molecular weight}} \times \frac{1000}{\text{volume}}[/tex]

Since, volume of acetic acid used is low. Therefore, molarity of acetic acid will be high.

Thus, we can conclude that the calculated molarity of acetic acid be high.