An aqueous solution of NaF can be made into a buffer by adding: Question options
ID: 494775 • Letter: A
Question
An aqueous solution of NaF can be made into a buffer by adding: Question options: a) CH3COONa b) NaOH c) F2 d) HBr The addition of HCl to a solution made from a 1.0 M acetic acid solution and a 1.0 M sodium acetate solution will: Question options: a) Increase the pH b) Not change anything, it is a buffer c) Decrease the concentration of acetic acid d) Increase the concentration acetic acid e) Consume the sodium acetate thus increasing the pH The pH of a solution made of 0.1 M acetic acid and 0.1 M potassium acetate is (Ka = 1.8 x 10-5) to which 0.001 mol of KOH has been added: Question options: a) pH = 4.74 WRONG b) pH = 11.55 c) pH = 4.46 d) pH = 8.92 e) pH = 4.73
Explanation / Answer
1) An aqueous solution of NaF can be made into a buffer by adding:
answer : option d) HBr
2) The addition of HCl to a solution made from a 1.0 M acetic acid solution and a 1.0 M sodium acetate solution will:
answer : d) Increase the concentration acetic acid
3)
pH = pKa + log [0.1 + 0.001 / 0.1 - 0.001]
= 4.74 + log 0.002
= 4.75
answer : 4.74
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