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11 Nov 2019
PREPARATION WORKSHEET Name: TA: Date: Section: Answer the following questions using information obtained from lecture, the textbook, or lab manual. The responses will be collected at the beginning of recitation and checked at the start ofyour lab section for credit. 1. You have a solution of the weak acid HA and add some of the salt NaA to it. a. What are the major species in the solution? b. What do you need to know to calculate [H,0'] concentration and the pH of the solu- tion, and how would you use this information? c. How does the pH of the HA solution compare with that of the final mixture? Explain. 2. A good buffer has: (a) about equal quantities of weak acid and conjugate base present; (b) as well as having a large concentration of each species present. Discuss this statement and why each aspect is important to successful buffering of a solution. 3. Calculate the pH at 25°C of 100.0 ml. of a buffer that is 0.100 M NH,CI and 0.100 M NH, before and after the addition of 1.0 mL of 6 M HNO3 Show your work. 14
PREPARATION WORKSHEET Name: TA: Date: Section: Answer the following questions using information obtained from lecture, the textbook, or lab manual. The responses will be collected at the beginning of recitation and checked at the start ofyour lab section for credit. 1. You have a solution of the weak acid HA and add some of the salt NaA to it. a. What are the major species in the solution? b. What do you need to know to calculate [H,0'] concentration and the pH of the solu- tion, and how would you use this information? c. How does the pH of the HA solution compare with that of the final mixture? Explain. 2. A good buffer has: (a) about equal quantities of weak acid and conjugate base present; (b) as well as having a large concentration of each species present. Discuss this statement and why each aspect is important to successful buffering of a solution. 3. Calculate the pH at 25°C of 100.0 ml. of a buffer that is 0.100 M NH,CI and 0.100 M NH, before and after the addition of 1.0 mL of 6 M HNO3 Show your work. 14
Jamar FerryLv2
13 Feb 2019