Posted by PLEASE HELP! on Monday, October 3, 2011 at 9:42pm.
If we call acetic acid HAc, then the pH will be determined by the hydrolysis of the salt. Convert pH 9.200 to OH^-. I get about 1.6E-5M
..............Ac^- + HOH -->HAc + OH^-
initial......x..............0.....0
equil......x-1.6E-5.......1.5E-5..1.6E-5
Kb = (Kw/Ka) = (HAc)(OH^-)/(Ac^-)
Substitute and solve for Ac^-,(answer will be in moles/L) and multiply that by 0.250 to find moles in 250 mL, then
that x molar mass NaAc give grams NaAc in 250 mL.
omg, thank u! I ended up getting something 1.70! THANKS!
Where I wrote 1.6E-5 for concn OH^-, I should have typed 1.6E-5 ALSO for (HAc) but I made a typo with 1.5E-5. By the way,
I think the answer is closer to 9 g. Post your work if you wish and I will look for the error.
I actually just redid it and found something close to 9.21?
Right. My answer was 9.22 g.
Related Questions
Chemistry - A sample of 8.44 grams of NaOH is dissolved into 536 mL of aqueous 0...
Chemistry - To prepare a 400 mL solution of .7500 M NaC2H3O2, how many grams of ...
chemistry - How many grams of sucrose,C12H22O11 must be dissolved in 750.mL of ...
Chemistry - How many grams of NaC2H3O2 (M=82.034 g mol-1) should be dissolved in...
chemistry - If you were to dissolve 14.00 grams of salicylic acid in enough ...
physical chemistry - How many grams of NaC2H3O2 (M = 82.034 g mol-1) should be ...
Chemistry - Calculate the molarity of a solution made by dissolving 0.0715 mol ...
Chemistry - I'm going crazy please help me out part 1 of 2 Determine the ...
Chemistry - Suppose you dissolve 10 grams of HCl gas in 250 ml of water ...
Chemistry HELP! - A student placed 10.5g of glucose (C6H12O6) in a volumetric ...
For Further Reading
