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Question 1.
Phenylboronic acid, C6H5B(OH)2, and benzonic acid, C6H5COOH, are both monoprotic (monobasic) acids, with pKa values of 8.86 and 4.20 respectively.

A 10.0 cm3 sample of X, a solution containing both of these acids, was titrated against 0.050 mol dm-3 NaOH using a mixture of two indicators, bromothymol blue and phenolphtalein.

It was found that 8.6 cm3 of NaOH(aq) were needed to change the colour of the first indicator and a further 7.1 cm3 were needed to change the colour of the second indicator.

(i) Sketch the shape of the pH curve during this titration.

(ii) Use the data to calculate the concentration of each of the two acids in X.

Someone help me with this question pleaseeeeeeeeeeeeeeeeeeeeee.