What volume of 0.200M HCl will react completely with 50.00ml of
(A) 100ml (B) 50ml (C) 25ml (D) 12.5ml
Which of the following reaction is spontaneous?
(A) Cu2+ + Fe -----> Cu + Fe2+ (B) Zn2+ + Cu-----> Zn + Cu2+
(C) 2Al3+ + 3Fe -----> 2Al + 3Fe2+ (D) none of the above
Which one of the following descriptions on the buffered solutions,
OH- + HA -----> A- +H2O , is incorrect?
(A) A buffered solution is one that gives a change in pH when wither
hydroxide ions or protons are removed.
(B) A buffered solution with a constant pH for blood is vital,because
cells can survive only in a very narrow pH range.
(C) Buffered solutions are simply solutions of weak acideor base
containing a common ion.
(D) The net result of buffering is that the equilibrium concentration
H+ and thus the pH are determined by the ratio [HA]/[A-]
(For a weak acid HA and its conjugate base A-)
- skyLv 41 decade agoFavorite Answer
50.00ml of 0.100M NaOH , 氫氧根離子=0.1*0.05=0.005mol
故需 0.200M HCl 0.005/0.2*1000=25ml
(A) Cu2 Fe -----> Cu Fe2
Cu → Cu2 2e- 氧化電位 -0.34
Fe → Fe2 2e- 氧化電位 0.44
A buffer solution has the property that the pH of the solution changes very little when a small amount of acid or base is added to it.
Buffer solutions are necessary to keep the correct pH for enzymes in many organisms to work. Many enzymes work only under very precise conditions
buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid.
The acid dissociation constant for a weak acid,Simple manipulation with logarithms gives the Henderson-Hasselbalch equation, which describes pH in terms of pKa