3) Which statement about buffers is faise a) they are prepared with a weak acid

Question

3) Which statement about buffers is faise a) they are prepared with a weak acid and its conjugate base b) they resist changes to pH c) they always maintain a neutral phH d) they are good to handle only strong bases 4) In any titration, the liquid in the burette is: b) the oxidizing agent the reducing agent d) the base a) the titrant 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(OHhO) Ca2.(ag) + 20H(ag) and H.(aq) + OH(aq) H2O(1) a) 0.000228M b) 0.0152M c) 0.00930M d) 0.0076M 7) Given the above data (question 6), what is the Kap for Ca(OH2? a) 1.76x10 b) 2.31x104 c) 5.78x103 d) 8.80x10

Explanation / Answer

3.C.Buffers do not maintain a neutral pH.they resist the change in the pH of the solution and maintain whatever the pH is but does not keep the pH neutral.

4. A.Titrant. titrant is the solution of known concentration which is used to find out the concentration of unknown solution. Burette always have the known solution.

So burette contains the titrant.

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