Calculating acids and bases?

by

Calculate the pH of an aqueous solution that is 0.20 M in HNO3 (aq) at 25 degrees Celsius. Acidic or base?

✅ Answers

? Best Answer

  • HNO3 is nitric acid

    In solution it dissociates as

    HNO3 = H^+ + NO3^-

    So one mole of HNO3 forms one mole of H^+

    Hence 0.20 M of HNO3 forms 0.2 moles of H^+

    pH = -log(10)[H+]
    pH = -log(10)[0.2]
    pH = -(-0.69897)
    pH = 0.69897
    pH = 0.70

    With a pH this low , then it is definitely an acid.

  • Dear Jones Jones

    Given: Calculate the pH of an aqueous solution that is 0.20 M in HNO3 (aq) at 25 degrees Celsius. Acidic or base?

    The pH of the compound of nitric acid is determined to be as follows.

    pH = -log[H+] = -log [ 0.20] = 0.70
    pH < 7.0
    Compound is acidic.

    HNO3 – Nitric acid (Strong acid)
    Nitric acid – Chemical Compound: Nitric acid, also known as aqua fortis and spirit of niter, is a highly corrosive strong mineral acid. The pure compound is colorless, but older samples tend to acquire a yellow cast due to the accumulation of oxides of nitrogen.

    Formula: HNO3
    Density: 1.51 g/cm³
    Molar mass: 63.01 g/mol
    Boiling point: 181.4°F (83°C)
    IUPAC ID: Nitric acid
    Melting point: -43.6°F (-42°C)

    For additional assistance and information please see also the following data link(s):
    http://en.wikipedia.org/wiki/pH
    http://chemistry.about.com/od/workedchem…
    http://chemistry.about.com/od/acidsbase1…
    http://chemistry.about.com/od/chemistryq…
    http://chemistry.about.com/od/acidsbase1…
    http://chemistry.about.com/od/acidsbases…
    http://www.infoplease.com/cig/chemistry/…
    http://www.elmhurst.edu/~chm/vchembook/1…
    http://www.sciencebuddies.org/science-fa…
    http://lrs.ed.uiuc.edu/students/erlinger…

    Source(s):
    http://www.chemspider.com/Chemical-Struc…
    https://en.wikipedia.org/wiki/Nitric_aci…

    • Leave a Comment