Question

The compound $ {H_3}B{O_3} $ IS:
A. Monobasic and weak Lewis acid
B. Monobasic and weak Bronsted acid
C. Monobasic and strong Lewis acid
D. Tribasic and weak Bronsted acid

Answer 1

Hint: he$ {H_3}B{O_3} $ is known as boric acid. Any acid is defined as monobasic or dibasic or tribasic; it depends upon its capacity of giving H+ IONS. ${H_3}B{O_3} $ Accepts the OH- IONS which act as a weak monobasic Lewis acid.

Formula used:FORMULA: $ {H_3}B{O_3} $

Complete answer:
$ {H_3}B{O_3} + {H_2}O \to B(OH)_4^ - + {H^ + } $
> The Water splits into OH- and H+ IONS whereas the OH- bonds with$ B{(OH)_3} $ forming$ B(OH)_4^ - $ while H+ IONS, is released in the solution. The most important thing to remember is that the H+ IONS coming from the water are not$ B{(OH)_3} $. Since, only one H+ can be released by a water molecule, boric acid is a monobasic acid.
> The Boric acid is also known as hydrogen borate, boracic acid and orthoboric acid moreover its behaviour towards some of the chemical reactions suggest it to be tribasic acid. Boric acid is used for antiseptic, insecticide, neutron absorber, flame retardant and other chemical compounds. It exist in the form of colourless crystals or a white power that dissolve in water.
BORIC ACID:
FORMULA: $ {H_3}B{O_3} $
MOLAR MASS: 61.83g/mol
MELTING POINT: 170.9$^ \circ C$
IUPAC ID: Boric acid, Trihydrooxidoboron.
SOLUBLE IN: Water and alcohol.

So, the correct answer is “Option A”.

Note:
1-Boric acid is less toxic to the human body.
2-If boric acid comes in contact with skin then it leads to skin irritation, red rashes and if in case boric acid is eaten it may lead to nausea, vomiting, stomach aches and diarrhoea.