Classify each as a strong or weak acid or base:

Sallie Banks 2021-12-18 Answered
Classify each as a strong or weak acid or base: (a) HOCH2CH2NH2, (b) H2SeO4, (c) HS, (d) B(OH)3
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Expert Answer

macalpinee3
Answered 2021-12-19 Author has 29 answers

Step 1
a) HOCH2CH2NH2
First let us write its dissociation reaction in water.
HOCH2CH2NH2+H2OOH1+HOCH2CH2NH3+
HOCH2CH2NH2 is basic because it produced OHion. Since it is an amine,
HOCH2CH2NH2 is a weak base.
Step 2
b) H2SeO4
First let us write its dissociation in water.
H2SeO4 is acidic because it produced H+ion. Since it is not a hydrohalic acid but an oxoacid, let us solve for the number of O and H atoms in the atoms. Their difference should be greater than or equal to 2.
There are 4O and 2H. 42=2 which is equal to 2. Therefore,
H2SeO4 is a strong acid.
Step 3
c) First let us write its dissociation reaction in water.
HSH++S2
HSO is acidic because it produced H+ ion. Since it is not a hydrohalic acid nor an oxoacid, HS is a weak acid.
Step 4
d) B(OH)3
First let us write its reaction in water.
B(OH)3+H2OB(OH)4+H+
B(OH)3 is acidic because it produced H+ ion. Since it is not a hydrohalic acid but an oxoacid, let us solve for the number of O and H atoms in the atoms. Their difference should be greater than or equal to 2.
There are 4O and 4H. 44=0 which is less to 2. Therefore, B(OH)3 is a weak acid.

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Jillian Edgerton
Answered 2021-12-20 Author has 34 answers
a) B(OH)3 is boric acid, not a hydroxide in the sense of the ionic hydroxides of Group 1,2, or the transition metals. It's more commonly written as H3BO3, and it is protonated borate, similar to sulfate, phosphate, or carbonate
b) Not because it's not listed as one of the strong acids, but the electronegativity of the selenium is not high enough to pull enough electron density off of the oxygens to make the hydrogens extremely acidic.
c) Through it can act as either (acting as a base to go to hydrogen sulfide or as an acid to go to sulfide ion), bisulfide tends to be more acidic than basic.
d) Ethanolamine acts as a base as the amino group can be protonated. There is almost no tendency for the alcohol group to get deprotonated.

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