Calculate the change in pH when 0.1400 mol OH– is added to 1.00 L of each of the following buffers. - 1.180 M  solution of sodium dihydrogen phosphate containing 1.180 M  sodium hydrogen phosphate Ans: change in pH = ________ - 0.5900 M  solution of sodium dihydrogen phosphate containing 0.5900 M  sodium hydrogen phosphate. Ans: change in pH = ________

7.Of the following solutions, which has the greatest buffering capacity? A. 0.205 M HF and 0.133 M NaF B. 0.135 M HF and 8.78×10−2 M NaF C. 0.409 M HF and 0.266 M NaF D. 0.818 M HF and 0.532 M NaF E.They are all buffer solutions and would all have the same capacity.

Help needed please

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…

Calculate the expected pH of the buffer.

You are interested in making a buffer with a pH of 7.30. Which of the following weak acid/conjugate base pairs would be most suitable to use? acid H3PO4 HCO₂H CH3CO₂H H₂PO4 NH4 HCO3 HPO4²- conjugate base H₂PO4 HCO₂ CH3CO₂ HPO4²- NH3 2- CO3²- PO4³- OHCO₂H/HCO₂ OCH3CO₂H/CH3CO₂ H₂PO4/HPO42- NH4 /NH3 2- HCO3 / CO3²- pka 2.16 3.75 4.75 7.21 9.25 10.33 12.32

How many moles of sodium hydroxide would have to be added to 150 mL of a 0.479 M hypochlorous acid solution, in order to prepare a buffer with a pH of 7.210? ____ moles