Chem. 220  CC #6      5points        Name _______________________________lab______

 

Attach your work on a separate sheet(s) of paper

 

  1. Would 1.0 M (NH4)2CO3 be acidic, basic or neutral?  ________

 

  1. What is the pH of a solution that has 1.0 M NH3 and 1.0 M NH4Cl ? ______

 

  1. What is the pH of a solution that is 1.0 M HNO2 and 0.50M NaNO2 ? ______

 

  1. What is the pH of 25.0 mL of 0.100 M HA mixed with 10.0 mL of 0.100 M NaA, Ka = 2.5 E-04 ?

_______________ 

 

  1. What is the pH of 50.0 mL of 0.100 M acetic acid after 20.0 mL of 0.100 M NaOH is added?

___________  

 

  1. What is the pH of 25.0 mL of 1.00 M (CH3)3N after 15.0 mL of 1.00 M HCl are added? ( Kb = 3.7 E-06 )

 

_______________

 

  1. How many mLs of 0.100 M HCl would you add to 100.00 mL of 0.100M NH3 to get an optimum buffer?

 

_____________________

 

  1. What does the pH of 1.00L of a buffer with 1.00 M HF and 1.00 M NaF equal after

A)    0.500 mole of HCl are added? (assume constant volume) _______

 

B)     1.10 mole of NaOH are added? (assume constant volume) _______