# chemistry 12

Calculate [H3O^-] in a 0.15M solution of benzoic acid, HC7H5O2(aq) having a Ka of 6.4 x 10^-5

I got.
6.4x10^-5=(x)(x)/0.15

6.4x10^-5= x^2/0.15

6.4x10^-5 x 0.15 = x^2

square root of 9.6x10^-6 = square root of x^2

x= 0.003098
The pH solution is -log [0.003098]
= 2.50

b.) Calculate the percent ionization of the HC7H5O.

%ion= (H^+)/0.15x100???? not sure of this?

1. 👍 0
2. 👎 0
3. 👁 117
1. a is ok.
b is ok if you used
%ion = [(H^+)/0.15]*100 = about 2%

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chemistry

a) Calculate [H3O^+] in a 0.15M solution of benzonic acid, HC7H5O2(aq) having K of 6.4x10^-5. b) Calculate the per cent ionization of the HC7H5O2. I got.. A) 0.16M but i did it again and got 7.2M so i'm very stuck as to the very

asked by Sarah on October 4, 2011
2. ### chem 12

a) Calculate [H3O^+] in a 0.15M solution of benzonic acid, HC7H5O2(aq) having K of 6.4x10^-5. b) Calculate the per cent ionization of the HC7H5O2. I got.. Kb = [HC7H5O3][OH]/HC7H5O2 6.3x10^-5 x Kb =1.0x10^-14 Kb =

asked by Sarah on October 11, 2011
3. ### Chemistry

Just two more to check, thanks! 1) The pH of a 1.25 M solution of unknown monoprotic acid is 5.43. Determine the value of Ka for this acid. HX H+ + X-. (I obtain 1.0 x 10^-11) 2) Calculate the pH of a solution which is 0.73 M

asked by Amanda on May 1, 2014
4. ### chemistry

Given 20g of benzoic acid contaminated with 0.4g of salicytic acid. 1)Determine the volume of hot water required to dissolve the mass of acid. 2)Calculate the mass of benzoic acid which participates when the solution is cooled to

asked by Jenny on October 21, 2015
5. ### 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
6. ### 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
7. ### Chemistry

You have 150 ml of a solution of benzoic acid in water estimated to contain about 5 g of acid. The distribution coefficient of benzoic acid in benzene and water is approx 10. Calculate the amount of acid that would be left in the

asked by Nat on November 22, 2010
8. ### Chemistry

You have 150 ml of a solution of benzoic acid in water estimated to contain about 5 g of acid. The distribution coefficient of benzoic acid in benzene and water is approx 10. Calculate the amount of acid that would be left in the

asked by Nat on November 22, 2010
9. ### chemistry

A 0.25 mol/L solution of benzoic acid, KC7H5O2 and antiseptic also used as a food preservative, has a pH of 2.40. Calculate the Ka of benzoic acid at SATP How does the benzoic acid ionization go?

asked by Sarah on April 6, 2008
10. ### Chemistry III

Assume you dissolve 0.240 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 1.16 102 mL of solution and then titrate the solution with 0.153 M NaOH. C6H5CO2H(aq) + OH -(aq) C6H5CO2-(aq) + H2O(l) (a) What was the

asked by Kelly on March 27, 2012

More Similar Questions