pKa values

Question 2

What is the acidity range of strong acids like HCl and HNO3?

Answer 2

All strong acids range from -5 to -10.

Question 3

What is the pKa of H3O+?

Answer 3

H3O+ has a pKa of 0.

Question 4

What is the acidity range of protonated alcohols (ROH2+)?

Answer 4

Protonated alcohols have a pKa range of -1 to -2.

Question 5

What is the acidity range of carboxylic acids (RCOOH)?

Answer 5

Carboxylic acids have a pKa range of 3 to 6.

Question 6

What is the pKa of protonated amines (RNH3+)?

Answer 6

Protonated amines are around 10.

Question 7

What is the pKa of NH4+?

Answer 7

NH4+ has a pKa of 9.24.

Question 8

What is the acidity range of thiols (RSH)?

Answer 8

Thiols have a pKa range of 8 to 10.

Question 9

What is the pKa of phenol?

Answer 9

Phenol has a pKa of 10.

Question 10

What is the pKa of water (H2O)?

Answer 10

Water has a pKa of 14.

Question 11

What is the pKa of methanol (CH3OH)?

Answer 11

Methanol has a pKa of 15.54.

Question 12

What is the acidity range of other alcohols (ROH’s)?

Answer 12

Other alcohols have a pKa range of 16 to 18.

Question 13

What is the pKa of alkyne C-H?

Answer 13

Alkyne C-H has a pKa of 25.

Question 14

What is the pKa of ammonia (NH3)?

Answer 14

Ammonia has a pKa of 38.

Question 15

What is the pKa of alkene C-H?

Answer 15

Alkene C-H has a pKa of 44.

Question 16

What is the pKa range of alkane C-H?

Answer 16

Alkane C-H has a pKa range of 50 to 60.

Question 17

What should be kept in mind regarding the pKa values?

Answer 17

There are slight variances based on possible resonance or the identity of R- groups.