Rank the following compounds in order of increasing acidity.

a. H2O, H3O-, Ho- == HO-, H2O, H3O-
b. NH3

a. HO-, H2O, H3O- (decreasing acidity)

b. NH3 (non-acidic, but it can act as a weak base when it reacts with water, forming NH4+)

a. H2O, H3O-, HO-

In this series, H2O is the least acidic compound as it does not have any positive charge and does not readily donate a proton. H3O+ (hydronium ion) is more acidic than H2O because it has a positive charge and readily donates a proton. Finally, HO- (hydroxide ion) is the most acidic as it has a negative charge and readily accepts a proton.

b. NH3
NH3 (ammonia) is a weak base and does not readily donate a proton. Therefore, it is not directly relevant to compare acids with bases. If we were to compare NH3 with other bases, it would be considered less acidic due to its weaker tendency to donate a proton.

To rank the compounds in order of increasing acidity, we need to consider their acid strength. Acidity is determined by the tendency of a compound to donate a proton (H+). The stronger the acid, the more easily it donates a proton.

a. H2O, H3O-, HO-:
To rank these compounds, we need to consider their conjugate bases. The conjugate base of an acid is the remaining species after the acid has donated a proton. Higher stability of the conjugate base indicates a stronger acid.

1) HO- (hydroxide ion) is the strongest base among the three compounds listed. It can accept a proton and form H2O.
2) H2O (water) is a weaker base than HO- because it is less likely to accept a proton.
3) H3O- (hydronium ion) is the weakest base among the three compounds because it is the conjugate acid of water. It is formed when water accepts an additional proton.

Therefore, the correct ranking in increasing acidity is: HO- < H2O < H3O-.

b. NH3 (ammonia):
To rank NH3 in terms of acidity, we need to consider whether it can donate a proton or not. Ammonia (NH3) is a weak base that can accept a proton, rather than donate one. Therefore, NH3 is not acidic and cannot be ranked in terms of acidity.

In summary:
a. HO- < H2O < H3O-
b. NH3 (not acidic)

Is this to show your answer? I would agree with OH^- to H2O to H3O^+ but I don't know what H3O- is.

And I don't understand part b.