Which of the following statements concerning buffers is false Buffers contain ap

Question

Which of the following statements concerning buffers is false Buffers contain appreciable amounts of a weak acid and its conjugate base. The pH of a buffer is close to the pKa of the weak acid from which it is made. Buffers are used to titrate weak bases. Buffers are resistant to changes in pH brought about by addition of strong acids and bases. Buffers are resistant to changes in pH brought about by addition of water. Which of the following pairs will form a buffer when mixed together in an aqueous solution KCI and KH_2PO_4 HF and NaF NaCI and NaOH HCI and KOH None of the above will form a buffer. Which of the following pairs will not form a buffer when mixed together in an aqueous solution Write the balanced reaction to see what products form. Na_2HPO_4 and NaH_2PO_4 H_3PO_4 and NaH_2PO_4 CH_3CO_2H and NaOH HCI and NaCH_3CO_2 Nal and HI The Ka of acetic acid is 1.8 x 10^-5. Calculate the pH of a solution which is composed of 0.250 M CH_3CO_2H and 0.250 M NaCH_3C0_2. 1.8 times 10 ^-5 0.25 0.60 4.74 7.20 The Ka of hypobromous acid, HOBr, is 2.5 x 10 ^-9. Calculate the pH of a solution which is composed of 0.150 M HOBr and 0.400 M NaOBr. 8.18 8.60 11.27 5.94 9.03

Explanation / Answer

the correct option is C.

Buffers are resistant to changs in pH brought about by addition of strong acids and bases only.

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