what is the concentration of hydroxide ions in pure water at 30.0 °c if kw at this temperature is 1.47 × 10-14?
What is the concentration of hydroxide ions in pure water at 30.0 °C if Kw at this temperature is 1.47 × 10^-14?
Answer:
To find the concentration of hydroxide ions in pure water at a specific temperature, we can make use of the Kw (ion product constant for water) value. Kw is the product of the concentrations of hydrogen ions (H+) and hydroxide ions (OH-) in water at a given temperature. At 30.0 °C, Kw has a value of 1.47 × 10^-14.
Since pure water is neutral, the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in pure water are equal. Therefore, the concentration of hydroxide ions (OH-) in pure water at 30.0 °C can be calculated by taking the square root of Kw.
Using the value of Kw = 1.47 × 10^-14, we can calculate the concentration of hydroxide ions in the following way:
OH- concentration = √Kw
OH- concentration = √(1.47 × 10^-14)
OH- concentration ≈ 1.21 × 10^-7 mol/L
Therefore, the concentration of hydroxide ions in pure water at 30.0 °C is approximately 1.21 × 10^-7 mol/L.