Question

23. What is the pH of an aqueous solution made by combining 38.64 mL of a...

23. What is the pH of an aqueous solution made by combining 38.64 mL of a 0.4904 M ammonium chloride with 39.77 mL of a 0.3735 M solution of ammonia to which 4.670 mL of a 0.0772 M solution of HCl was added?

41. In a titration of 40.09 mL of 0.3795 M ammonia with 0.3795 M aqueous nitric acid, what is the pH of the solution when 40.09 mL of the acid have been added?

71. what is the molar solubility of barium fluoride?

Homework Answers

Answer #1

23) pH of basic buffer =14 - (pkb+log(NH4Cl+HCl/NH3-HCl))

     pkb of NH3 = 4.75

no of mol of NH4Cl ADDED = 38.64*0.4904 = 18.95 mmol

no of mol of NH3 added = 39.77*0.3735 = 14.85 mmol

no of mol of Hcl added = 4.67*0.0772 = 0.36 mmol

pH = 14-(4.75+log((18.95+0.36)/(14.85-0.36))

    = 9.12


41)     pkb of NH3 = 4.75

no of mol of NH3 added = 40.09*0.3795 = 15.21 mmol

no of mol of HNO3 added = 40.09*0.3795 = 15.21 mmol

so that , now the system is at equivalence point.

concentration of salt = 15.21/(40.09+40.09)

pH = 7-1/2(pkb+logC)

     = 7-1/2(4.75+log0.19)

     = 4.98

71) Ksp of BAf2 = S*(2S)^2

           Ksp    = 4S^3

   (1.84*10^-7) = 4s^3

s = solubility of BaF2 = 3.58*10^-3 M

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
What is the pH of an aqueous solution made by combining 39.42 mL of a 0.3856...
What is the pH of an aqueous solution made by combining 39.42 mL of a 0.3856 M ammonium chloride with 39.60 mL of a 0.3222 M solution of ammonia to which 4.802 mL of a 0.0876 M solution of HCl was added?
29. What is the pH of an aqueous solution made by combining 40.03 mL of a...
29. What is the pH of an aqueous solution made by combining 40.03 mL of a 0.4322 M sodium fluoride with 44.86 mL of a 0.3356 M solution of hydrofluoric acid to which 3.619 mL of a 0.0543 M solution of HCl was added?
14 a) What is the pH of an aqueous solution made by combining 44.88 mL of...
14 a) What is the pH of an aqueous solution made by combining 44.88 mL of a 0.4753 M sodium acetate with 49.51 mL of a 0.3245 M solution of acetic acid? b) What is the pH of an aqueous solution made by combining 10.36 mL of a 0.1300 M hydrochloric acid with 44.43 mL of a 0.3896 M solution of ammonia?
In a titration of 49.51 mL of 0.3605 M ammonia with 0.3605 M aqueous nitric acid,...
In a titration of 49.51 mL of 0.3605 M ammonia with 0.3605 M aqueous nitric acid, what is the pH of the solution when 49.51 mL of the acid have been added?
In a titration of 43.60 mL of 0.3540 M ammonia with 0.3540 M aqueous nitric acid,...
In a titration of 43.60 mL of 0.3540 M ammonia with 0.3540 M aqueous nitric acid, what is the pH of the solution when 43.60 mL of the acid have been added?
In a titration of 36.14 mL of 0.3153 M ammonia with 0.4091 M aqueous nitric acid,...
In a titration of 36.14 mL of 0.3153 M ammonia with 0.4091 M aqueous nitric acid, what is the pH of the solution when 36.14 mL + 10.00 mL of the acid have been added?
A 21.1 mL sample of a 0.485 M aqueous hypochlorous acid solution is titrated with a...
A 21.1 mL sample of a 0.485 M aqueous hypochlorous acid solution is titrated with a 0.347 M aqueous sodium hydroxide solution. What is the pH at the start of the titration, before any sodium hydroxide has been added? 12- A 24.0 mL sample of 0.323 M ethylamine, C2H5NH2, is titrated with 0.284 M nitric acid. At the titration midpoint, the pH is :________________.
17. A 25.0-mL sample of 0.20 M NH3 is titrated with 0.20 M HCl. What is...
17. A 25.0-mL sample of 0.20 M NH3 is titrated with 0.20 M HCl. What is the pH of the solution after 15.00 mL of acid have been added to the ammonia solution? (NH3 has Kb = 1.8 x 10–5) 18. The Ksp of silver chloride is 1.6 x 10–10. (a) Calculate the molar solubility. (b) Dissolve 0.01 moles of NaCl to 1.0 L of water; calculate the molar solubility of AgCl in this salt water.
A. A 11.3 g sample of an aqueous solution of hydrobromic acid contains an unknown amount...
A. A 11.3 g sample of an aqueous solution of hydrobromic acid contains an unknown amount of the acid. If 12.8 mL of 0.122 M barium hydroxide are required to neutralize the hydrobromic acid, what is the percent by mass ofhydrobromic acid in the mixture? = % by mass B. A 10.4 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid. If 25.9 mL of 0.403 M barium hydroxide are required to neutralize...
43.       In a titration of 35.35 mL of 0.3509 M nitric acid with 0.4242 M aqueous...
43.       In a titration of 35.35 mL of 0.3509 M nitric acid with 0.4242 M aqueous sodium hydroxide, what is the pH of the solution when 35.35 mL of the base have been added?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT