Posted by Brittany on Monday, April 30, 2007 at 3:48pm.
A 10g sample of aniline hyrdochloride is dissolved in 250 mL of solution.
C6H5NH2-HCl(s) => C6H5NH3+ (aq)+ Cl-(aq)
H2O is shown over the arrow.
What is the pH of the solution?
You have added a salt to water. The pH will be determined by the (H^+) of the solution from the hydrolyzed salt; i.e., reaction with water.
C6H5NH3^+ + HOH ==> H3O^+ + C6H5NH2
At the beginning (C6H5NH3^+) = 10g/molar mass/0.250 L.
(H3O^+) initially is zero (from the hydrolysis).
C6H5NH2 initially is zero.
What happens in the hydrolysis.
x molar C6H5NH3^+ hydolyzes; therefore, x mol C6H5NH2 is formed and x mol H3O^+ is formed. How much C6H5NH3^+ remains? It will be beginning molarity minus x.
Now write the equilibrium equation, plug in the values and solve for x.
Convert that to pH.
Ka = (C6H5NH2)(H3O^+)/(C6H5NH3^+)
Post your work if you get stuck.
I got that far but I do not have the Ka value, so I am stuck.
No problem. You can convert any Ka or any Kb with Kw = KaKb. Kw, of course, is 1E-14. You look up the Kb for aniline. There should be a table of ionization constants in your text or notes.
So I just plug the numbers into that equation, and then use the Ka to in the equilibrium constant equation, and then plug X in the equation for pH? Will that be the pH or the pOH?
Look at the equation. Did we let x stand for OH or H.
Thank you so much!!
- Chemistry - Katie Hodge, Wednesday, January 28, 2009 at 5:11pm
- shpe xwvobcfz - shpe xwvobcfz, Sunday, February 1, 2009 at 11:01pm
zfik kfbejvst qapywskr cqbamld reqdmoanv equwvkzt tmnyc
- Chemistry - Barbra, Monday, November 2, 2009 at 1:24pm
Thanks so much
Man i love chemistry, god whenever i see those diagrams i get so wet i just have to pinish myself off right there and then, pinching and teasing my tender nipples while i work my sweet little !@#$%^&...
- Chemistry - Barbra, Monday, November 2, 2009 at 1:25pm
Thanks so much
Man i love chemistry, god whenever i see those diagrams i get so wet i just have to finish myself off right there and then, pinching and teasing my tender nipples while i work my sweet little holes...both of them.
Answer this Question
Chemistry - What stoichiometric concentration of the indicated substance is ...
Chemistry, reactions w/ water - Write the equation for the reaction of each of ...
Chemistry - Calculate the mass in g of aniline (C6H5NH2, Kb = 4.3 x 10-10) that ...
chemistry - Can someone give me some directions as to how to reach the answer ...
chemistry - The pH of saturated Sr(OH)2 (aq) is found to be 13.12. A 10.0 mL ...
Chemistry: Molarity - 4.82 mL of a 0.262 M NaOH solution reacts completly with 4...
Chemistry - Could someone please help me with these two questions. I am having ...
Chemistry - A 0.450-gram sample of impure CaCO3(s) is dissolved in 50.0 mL of 0....
Science - C6H5NH2 + H2O C6H5NH3+ + OH- 1. Aniline, a weak base, ...
chemistry - You have 1.600g mixture of NaHCO3 and Na2CO3. You find that 11.60 ml...
For Further Reading