Respuesta :

maacastrobr

Answer:

[H⁺] = 16.6 (±1.9) x10⁻⁴ M

Explanation:

The pH is defined as:

  • pH = -log[H⁺]

So we can calculate [H⁺]:

  • 2.78 = -log[H⁺]
  • -2.78 = log[H⁺]
  • [H⁺] = [tex]10^{-2.78}[/tex]

[H⁺] = 1.66x10⁻³ M

The relative uncertainty in [H⁺] is

  • uR/R = 2.303 x AbsoluteUncertainty
  • uR/R = 2.303 * 0.05 = 0.115

Thus the uncertainty in the concentration is:

1.66x10⁻³ M * 0.115 = 1.91x10⁻⁴ M

Otras preguntas