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Equilibrium — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryEquilibrium1 Mark
MCQ
H2​O is a:
  • A
    Proton acceptor.
  • B
    Roton donor.
  • C
    Both proton donor and proton acceptor.
  • D
    Neither proton donor, nor proton acceptor.
✓

Answer

  1. Both proton donor and proton acceptor.

Explanation:

A compound such as water (H2​O) has many interesting properties. Water molecules can accept a proton to act as Bronsted-Lowry bases in certain circumstances. The following is an example of HCl dissolving in water:

$\text{HCl}+\text{H}_2\text{O}(\ell)\rightarrow\text{H}_3\text{O}^+_\text{(aq)}+\text{C}1^-_\text{(aq)}$

The another possibility is water can act like a Bronsted-Lowry acid by donating a proton. Water donates a proton to a proton-accepting amide ion in the presence of ammonia, resulting in the following product:

$\text{H}_2\text{​O}\ell{(ℓ)}​+\text{NH}^-_2\text{(aq)}​\rightarrow\text{OH}^-_{\text{(aq)}}​+\text{NH}_3\text{(aq)​}$

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