About _____ molecules in a glass of water are dissociated

about _____ molecules in a glass of water are dissociated.

about _____ molecules in a glass of water are dissociated.

Answer: The number of molecules in a glass of water that are dissociated depends on several factors, including the temperature and the presence of ions. In pure water at room temperature (around 25 degrees Celsius or 77 degrees Fahrenheit), a small fraction of water molecules undergo a process called “self-ionization” or “autoionization,” which leads to the formation of hydronium ions (H3O+) and hydroxide ions (OH-) according to the following equilibrium reaction:

2 H2O(l) ⇌ H3O+(aq) + OH-(aq)

In this reaction, two water molecules combine to produce one hydronium ion (H3O+) and one hydroxide ion (OH-). This process is reversible, meaning that hydronium and hydroxide ions can also recombine to form water molecules.

In pure water at room temperature, the concentration of both hydronium ions (H3O+) and hydroxide ions (OH-) is approximately 1.0 x 10^-7 moles per liter (M). This is because the equilibrium constant for the reaction is approximately 1.0 x 10^-14 (at 25°C), which means that the product of the concentrations of hydronium and hydroxide ions ([H3O+][OH-]) is a constant value.

So, in a glass of pure water at room temperature, you would have approximately 1.0 x 10^-7 moles per liter of both hydronium ions (H3O+) and hydroxide ions (OH-). This is a very small fraction of the total water molecules in the glass, given that there are roughly 6.022 x 10^23 water molecules in one mole of water.