Which of the following combinations would not result in a buffer sobution? ) CH.

Question

Which of the following combinations would not result in a buffer sobution? ) CH.COOH/CH COONs d) HF/KF 2) A buffer solution consists of HF and NaF has pH of 3.17. What would be the reasonable plH of the solution if a very small amount of NaOH is added to i? a) 3.10 b) 3.25 c) 3.17 d) 43 3) Which statement about buffers is false a) they are prepared with a weak acid and its conjugate base b) they resist changes to pH c) they always maintain a neutral pH d) they are good to handle only strong bases 4) In any titration, the liquid in the burette is: a) the titrant b) the oxidizing agent c) the reducing agent d) the base 5) The molar solubility of barium sulfate was calculated to be 0.00256M. Which of the following answers would seem reasonable for the new molar solubility, if a small amount of barium nitrate is added? a) 0.00256M b) 000384M c) 0.00157M d) none seem reasonable 6) If 11.4 mL of HCI (ag) that is 0.020M is needed to react completely with 15.0 mL. of saturated calcium hydroxide solution to a faint red-orange endpoint, the molar solubility of the calcium hydroxide is: Ca(OH)2(s) Car(aq) + 20H(ag) and H.(aq) + OH.(aq) H:0a) a) 0.000228M b) 0.0152M c) 0.00930M d) 0.0076M 7) Given the above data (question 6, what is the Kp for CalOH2? a) 1.76x10 b) 2.31x10 c) 5.78x10 d) 8.80x10

Explanation / Answer

1. Answer: Option B

For Acidic Buffer solutions it is mandatory to take a weak acid and its salt. e.g; CH3COOH and CH3COONa

For Basic Buffer solutions it is mandatory to take a weak salt and its salt. e.g; NH4OH and NH4Cl

Now here among all the options given, only H2SO4/NaHSO4 is a strong acid and its salt.

Thats why it can't acts as a buffer solution.

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