Calculate the molarity (M) of a solution of the strong base RbOH if the hydroxide ion concentration is 0.000309 M.
Strong bases ionize 100%. Here OH^- is 0.000309. Convert to pOH then to pH.
To calculate the molarity (M) of a solution, you need to know the number of moles of solute (in this case, the strong base RbOH) and the volume of the solution.
In this case, you are given the hydroxide ion concentration (0.000309 M), and since RbOH is a strong base, it completely dissociates in water to produce one hydroxide ion (OH-) for each RbOH molecule.
The hydroxide ion concentration (OH-) is the same as the concentration of RbOH, so the number of moles of RbOH can be directly calculated from the given concentration.
To calculate the number of moles of RbOH, you multiply the concentration (in moles per liter) by the volume of the solution (in liters):
moles of RbOH = concentration of RbOH (M) x volume of solution (L)
Since the volume of the solution is not given in this question, you cannot calculate the molarity without the volume information.