Question

2. Soda has a pH between 3 and 4. Soda makers often add citric acid to give a tart taste to soda. 20 ml of 0.1 M citric acid (H 3C6H57, pa 3.1, pKa2 4.7, pKa3 6.4) is titrated with 0.1 M NaOH a2 4.7, pka3 6.4) is titrated pH 0 10 20 30 40 50 60 volume of NaOH Citric acid can be used as a buffer. The formula and charge of citric acid (H3CsH5o7, H2C6Hso, HCGH,o, CH3) depends on the pH. 36' '5 72 6 576 57 6' 5 a. Calculate Ka1. Write a number in scientific notation as_E__ Use 2 significant figures. Your answer b. Calculate the pH at Point A. Give a number with 2 significant figures only. Do not include text. Your answer c. Write the formula or equation to calculate the pH at Point C. If a pKa is in your formula or equation, specify pKa1 or pKa2 or pKa3. Your answer

Answer 1

k at -3-1 ILe -at 2 0009tx