Acids and Bases

Question 1

How to form an effective buffer

Answer 1

High concentration and ratio of [base]/[acid]=0.1-10

Question 2

Which one is more acidic? HF or HI

Answer 2

HI. Size↑, charge spread over greater volume.

Question 3

Which one is more acidic? H2O or CH4

Answer 3

H2O. More electronegative

Question 4

Which one is more acidic? [Fe(H2O)6]3+ or Fe(H2O)5(OH)2+

Answer 4

[Fe(H2O)6]3+. Charge of the metal ion ↑, radius ↓, attract electron density from O, proton is more readily to lose.

Question 5

Arrange the increasing base strength of (CH3)3N, H3N, F3N

Answer 5

F3N<H3N<(CH3)3N

Question 6

Arrange the increasing acid strength of (CH3)3B, H3B, F3B

Answer 6

(CH3)3B< H3B< F3B

Question 7

Hard metal ion

Answer 7

alkali metal ions, alkaline earth metal ions and highly charged ions

Question 8

Soft metal ion

Answer 8

transition metal, low charged ions

Question 9

Arrange the acids from hard to soft. Br-, F-, Cl-, I-

Answer 9

F->Cl->Br->I-