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We highly encourage our visitors to purch ase orig inal books from the respected publishers. If someone with copyrights wants us to remove this content, please contact us. Moreover Medstudentscorner. The initial pH 8. We can calculate how much of the 10 mmol of HCl 10 mL 1.

Following titration, we have 7. Since we started with 10 mmol of the compound and an equal amount of HCl, then The remaining Therefore, the initial solution must have contained 1.

Again using the Henderson- Hasselbalch equation, we can calculate pK A biochemist makes up mL of a 0. She then adds 40 mL of 0. Answer The initial pH of 5. Initially, the pH was 5. Thus, in the initial solution, the ratio of [HisH ] to [His] is 4 to 1; 4 out of 5 of the imidazole groups were initially protonated. The initial solution contains The amount of HCl added was 4.

The other 2. From these ratios of acid and base after the titration, we can calculate the final pH: pH 1.

She adds 6. What was the pH of the original solution? Answer First calculate the ratio of acid to conjugate base in the final solution: pH. The initial amount of the compound is 10 mmol mL 0. So after HCl addi- tion, 8.

The amount of HCl added was 6. Now we can calculate the pH of the initial solution: pH. Phosphoric acid H3PO4 , a triprotic acid, has 3 pKa values: 2. Hint: Only one of the pKa values is relevant here. Preparation of Standard Buffer for Calibration of a pH Meter The glass electrode used in com- mercial pH meters gives an electrical response proportional to the concentration of hydrogen ion.

To convert these responses to a pH reading, the electrode must be calibrated against standard solutions of known H concentration. See Problem 22 for the pKa values of phosphoric acid. Answer In solution, the two salts ionize as indicated below. Therefore, to make 1. Briefly justify your answer.

Answer Acetic acid; its pKa is closest to the desired pH. Working with Buffers A buffer contains 0. Surfing the net and discovering websites offering university chemistry textbooks is quite possible. Lots of websites out there offer university chemistry textbooks to college students and professional learners.

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