Which of the following equations accurately describes an 0.10 M H2Gly solution?
(a) [H3O+] ≈ [H2Gly]
(b) [H3O+] > [H2Gly]
(c) [H3O+] < [HGly-]
(d) [H3O+] ≈ [HGly-]
(e) [H3O+] > [HGly-]
Chemistry · Sun Jul 10 2022
Answered on
The equation that accurately describes a 0.10 M H2Gly solution is (a) [H3O+] ≈ [H2Gly].
In chemistry, the concentration of a solution is often given in terms of moles per liter (M). The concentration of a solution tells us how much solute (in this case, H2Gly) is dissolved in a solvent (usually water). The equation (a) [H3O+] ≈ [H2Gly] means that the concentration of hydronium ions (H3O+) is approximately equal to the concentration of H2Gly ions in the solution.
Hydronium ions, represented as H3O+, are formed when water molecules, H2O, gain a hydrogen ion, H+. H2Gly is a weak acid, meaning it only partially dissociates in water to produce hydrogen ions. In this case, the concentration of H3O+ ions would be approximately equal to the concentration of H2Gly ions in the solution.
It is important to note that in a H2Gly solution, there will also be a small concentration of the conjugate base, HGly-. However, in this particular case, the equation (d) [H3O+] ≈ [HGly-] is not accurate because the concentration of HGly- would typically be lower than the concentration of H2Gly.
Therefore, the correct equation to describe a 0.10 M H2Gly solution is (a) [H3O+] ≈ [H2Gly].