# chemistry

Calculate the pH of a solution (to 2 decimal places) which is 0.106 M in phenol, Ka = 1.0 x 10-10.

1. 👍 0
2. 👎 0
3. 👁 45
1. Let's let HPh equal phenol with H representing the hydrogen that ionizes and Ph representing the remainder of phenol.
HPh ==> H^+ + Ph^-

Write the Ka expression.
Ka = 1 x 10^-10 = [(H^+)(Ph^-)]/(HPh)

Before the ionization (HPh) = 0.106 M.
Before the ionization (H^+)=(Ph^-)=0
After ionization, (H^+)= x
(Ph^-) = x
(HPh) = 0.106 - x

Plug these variables into the Ka expression and solve for x = (H^+).
Then convert (H^+) to pH with pH = - log(H^+). Post your work if you get stuck.

1. 👍 0
2. 👎 0
2. pH= -log(1.0x10^-10) + log x/0.106-x.
how??

1. 👍 0
2. 👎 0
posted by shiro

## Similar Questions

1. ### Chemistry

1. Calculate the pH of a buffer solution that contains 0.32 M benzoic acid (C6H5CO2H) and 0.17 M sodium benzoate (C6H5COONa). [Ka = 6.5 × 10-5 for benzoic acid] Round your answer to two places past the decimal. 2. A solution is

asked by Erin on April 8, 2013
2. ### Chemistry

1. Calculate the pH of a buffer solution that contains 0.32 M benzoic acid (C6H5CO2H) and 0.17 M sodium benzoate (C6H5COONa). [Ka = 6.5 × 10-5 for benzoic acid] Round your answer to two places past the decimal. 2. A solution is

asked by Erin on April 8, 2013
3. ### chemistry

Calculate the air concentration (mol/l) of phenol in equilibrium with solution including 100 g/m3 of phenol.(T=20 C)

asked by Osama on October 7, 2014
4. ### chemistry

Calculate the air concentration (mol/l) of phenol in equilibrium with solution including 100 g/m3 of phenol.(T=25 C)

asked by Osama on September 30, 2014
5. ### College Chemistry!!

Calculate the relative concentration of phenol (ka=1.05x10^10) and phenolate ion in a solution with 0.05M total phenol (pH=7.5)

asked by Siobhan on May 11, 2017
6. ### Chemistry

Calculate the pH of an aqueous solution at 25 degress C that is .41 M in phenol (C6H5OH). Ka for phenol=1.3 x 10^-10.

asked by Natalie on December 8, 2010
7. ### Chem

Phenol is a weak acid. We take 3.7 grams of phenol and dissolve it in 65 ml of water. To that water we add 40 ml of a 0.52 M solution of NaOH. You will need to look up the Ka value for Phenol a. What is the pH when the phenol is

asked by Jordan on November 13, 2016
8. ### math

round result to two decimal places...the answer i have is: 7.023 so two decimal places would it be: 702.0 You're asked to round to two decimal places. 7.023 = 7.02. Your answer has only one decimal place. so i guess my answer is

asked by student on July 15, 2007
9. ### another college chem

Calculate the boiling point of a 4.35 m benzene solution in phenol. (phenol bp=181.75 degree C and Kb=304 degree C/m)

asked by laney on April 27, 2010
10. ### math help

Can some one help me with this one??? Consider the following bivariate data. Point A B C D E F G H I J x 3 4 2 1 7 2 1 0 4 2 y 1 7 3 3 6 6 5 0 6 2 (a) Construct a scatter diagram of the given bivariate data. (Do this on paper.

asked by Tom614 on June 11, 2013

More Similar Questions