× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
5
a
5
k
5
c
5
B
5
l
5
C
4
s
4
a
4
t
4
i
4
r
4
Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
New Topic  
ripp2373 ripp2373
wrote...
Posts: 18
Rep: 0 0
11 years ago
Sodium benzoate (NaC7H5O2) is used as a food preservative. The Ka of benzoic acid is 6.46 x 10^ -5M. What is the ratio of the concentration of benzoic acid to the concentration of benzoate ion in a food with pH=3.00?
Read 636 times
1 Reply

Related Topics

Replies
wrote...
#1
11 years ago
Are you OK with using the Henderson-Hasselbalch equation? If so,

first calculate pKa for benzoic acid: pKa = - log Ka

The H-H equation is:

pH = pKa + log [base]/[acid]

In this problem, you are asked to calculate the ratio of acid to benzoate. When you solve the H-H equation for the log term ratio, you will need to take 1/_____.

Message me if this doesn't make sense...I'll try again tomorrow.
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1316 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Related Images
  
 61
  
 6150
  
 218
Your Opinion
Which is the best fuel for late night cramming?
Votes: 145
Previous poll results: Where do you get your textbooks?