Things I Keep Forgetting

Question 1

What can react with added acid to maintain ph

Answer 1

Proton acceptor
-weak base (basic buffer)
-strong conjugate base (Acidic buffer)

Question 2

What can react with added base to maintain ph

Answer 2

Proton donor
-weak acid (acidic buffer)
-strong conjugate acid salt (basic buffer)

Question 3

Why is buffer solution present

Answer 3

Interacted weak acid and salt of weak acid therefore ph change is more gradual.

Question 4

Why does diluting buffer with water keep ph unchanged

Answer 4

Affects both [HA] and [A-] equally
Equal mole of H+ and OH- added

Question 5

Best oxidising agent

Answer 5

Best at accepting e- therefore highest E0 value on left hand side

Question 7

Best reducing agent

Answer 7

Best at donating e- therefore lowest E0 value and bottom most -ve value

Question 8

Will H+ with E0 of 0.00 V react with Zn with E0 of -0.76?

Answer 8

E0 of H+/H2> E0 of Zn2+/Zn
Therefore H+ can oxidise Zn

Question 9

Will Au E0 1.68 V react with O2 E0 1.23 V?

Answer 9

No as E0 Au> E0 of O2 therefore O2 can’t oxidise Au

Question 10

Why Zn reduces aq solution of VO2+ tobV2+ but no further

Answer 10

E0 of v3+/V2+> E0 Zn2+/Zn
but
E0 of V2+/V< E0 Zn2+/Zn

Question 11

Hydrogen electrode

Answer 11

Always on LHS