University:
Glendale Community College
Course:
CHM130 | Fundamental Chemistry
Academic year:

2020
Views:

111

Pages:

2
Author:

Davon Fischer

Take -Home Buffer Assignment The purpose of this assignment is to give you practice with doing buffer/pH problems. You may work on this assignment with other classmates. However, if you do not think through the problems yourself, it will defeat the purpose of this assignment (the whole “you’re just cheating yourself” thing). In each container, show the major chemical species in solution. The first container is before adding any base. Each additional container, 1 mol of a strong base or acid is added. Below each container, summarize the types of calculations needed (multiple containers may need the same type of calculation). All calculations except the first container will need a “change table”. 1 mol NaOH Buffer Solution 1 mol NaOH 1 mol NaOH HA A- HA AHow would you calculate pH? 1 mol HCl Buffer Solution HA A- HA A- How would you calculate pH? 1 mol HCl 1 mol HCl 1. Determine the pH of 100.0mL of a buffer solution containing 0.200M HNO2 and 0.200M KNO2. Ka for HNO2 is 4.0x10-4. 2. Calculate the pH if 30.00mL of 0.150M NaOH was added to the buffer from question 1. 3. Calculate the pH if 10.00mL of 2.00M HBr was added to the buffer from question 1. 4. Calculate the pH if 15.00mL of 2.00M HBr was added to the buffer from question 1.