Which one of the following pairs cannot be mixed together to form a buffer solut

Question

Which one of the following pairs cannot be mixed together to form a buffer solution? KOH, HNO_2 H_2SO_3, KHSO_3 NaCl, HCl RbOH, HF HONH_2, HONH_3CI A solution containing which one of the following pairs of substances will be a buffer solution RbCl, HCl Nal, HI CsF, HF KBr, HBr none of the above Which of the following could be added to a solution of potassium fluoride to prepare a b sodium fluoride potassium acetate hydrochloric acid sodium hydroxide ammonia The Henderson-Hasselbalch equation is pH = log [acid]/[base] pH = pK_a + log [acid]/[base] pH = pK_a - log [base]/[acid] pH = pK_a + log [base]/[acid] [H^+]= K_a + [base]/[acid]

Explanation / Answer

1) Correct option (C) NaCl/HCl

A buffer is a mixture of a weak acid and its conjugate base (or equivalently a weak base and its conjugate acid). It resists changes in pH because the acid can neutralize added base and the conjugate base can neutralize added acid. HCl is a very strong acid, which dissociates completely in water to form H+ and Cl-. But Cl- is a weak base that it will not absorb added H+ to resist changes in pH, which is suppose to do by a buffer solution.

2) Option (E)

3) not a complete question.

4) Option D

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