What is the pH of a buffer that is 0.6 M HF and 0.2 M NaF? The Ka of HF is 6.8 Ã 10â4. What is the pH of a buffer that is: a. 3.65b. 3.17c. 3.50d. 2.69

The correct option is  d

Step-by-step explanation:

From the question we are told that

   The concentration of  HF  is  [HF] =  0.6 M

   The concentration of  NaF  is  

   The Ka of  HF  is  

Generally HF(Hydrogen fluoride )  is ionized as follows  

Generally NaF(Sodium fluoride )  is ionized as follows  

Generally the from Henderson-Hasselbalch equation the pH of the buffer is mathematically represented as

=>    

=>    

=>    

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.