4. a. A buffer is prepared by mixing 0.900 mole of ammonia and 0.850 mole of ammonium chloride to form an aqueous solution with a total volume of 0.500 litre. b. 30.0 ml of 1.00 M NaOH was added to 350 ml of this solution. What is the pH of the solution before and after the addition of NaOH? Show Transcribed Text Alternatively, how many moles of NaOH are required to react with 0.850 mol of ammonium chloride to form an aqueous buffer solution with a total volume of 0.500 litres, and a pH of 9.00?

You have two buffered solutions. Buffered solution 1 consists of 5.0 M HOAc and 5.0 M NaOAc; buffered solution 2 is made of 0.050 M HOAc and 0.050 M NaOAc.   How do the pHs of the buffered solutions compare?   Select one: a. The pH of buffered solution 1 is greater than that of buffered solution 2. b. The pH of buffered solution 2 is greater than that of buffered solution 1. c. The pH of buffered solution 1 is equal to that of buffered solution 2. d. Cannot be determined without the Ka values. e. None of these (A-D).

Helppppppppl

III. Acids, Bases, Buffers: 1. Using following equation, explain how buffers work. НА - H+ Proton Conjugate Ba se Acid

7,8

8b.

7. A solution was made by mixing 50.0 mL of 0.750 M HCN with 25.0 mL of water. What is the pH of this solution? The pka of HCN = 9.31. 8. One of the compounds featured on the TV series "Breaking Bad" was hydrofluoric acid (HF), pKa = 3.14. a) A solution of HF has a pH = 1.77. What was the initial [HF] for this solution in mol L-1? b) What is the equilibrium concentration of F in this solution in mol L-1? c) What is the percent ionization of HF in this solution?

1.  all the aqueous solutions that are good buffer systems 2.  a buffer solution is 0.421 m in hcn and 0.281 m in kcn, if Ka for Hcn is 4.0 * 10^-10. what is the PH of this buffer solution. b. a buffer solution is 0.495 m in h2s and 0.354 m in khs, if Ka1 for H2s is 1.0 * 10^-7. what is the PH of this buffer solution. c. a buffer solution is 0.455 m in NaHSO and 0.299 m in Na2SO3, if Ka for HSO3 is 6.4 * 10^-8. what is the PH of this buffer solution.  3. A 28.9 ml sample of a 0.385 m aqueous hydrocyanic acid solution is titrated with a 0.372 m aqueous sodium hydroxide solution. what is the ph at the start of the titration, before any sodium hydroxide has been added. b. A 31.9 ml sample of a 0.599 m aqueous hydrofluoric acid solution is titrated with a 0.242 m aqueous barium hydroxide solution. what is the ph after 15.8ml of base has been added. c. when a 23.8 ml sample of a 0.357 m aqueous acetic acid solution is titrated with a 0.459 m aqueous barium hydroxide solution. what is the ph…

An analytical chemist is titrating 109.3 ml. of a 0.8700 M solution of butanoic acid (HC,H,CO,) with a 0.9500 M solution of NaOH. The pK, of butanoic add is 4.82. Calculate the pH of the and solution after the chemist has added 36.93 mL of the NaOH solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of NaOH solution added. Round your answer to 2 decimal places. pH = 0 X

During a titration a 0.30 L sample of H2SO4 requires 569 mL of 2.50 M NaOH to reach the equivalence point. What is the initial concentration of H2SO4? (Do not include units in your answer. If you round during your calculation make sure to keep at least 3 decimal places. Report your answer to 2 decimal places.)