It depends on the molar concentration (Number of moles per liter of solution, a mole is 6.022X1023 formula units). Since it is a strong base that gives one hydroxide ion per formula unit, the pH of an RbOH solution is equal to 14 + the logarithm of the molar concentration. So a 1.0M solution has a pH of 14, a .1M solution has a pH of 13 and so on until a pH of about 7.
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The pH level of rubidium hydroxide solution depends on its concentration. For a dilute solution, it would be around 14, indicating a strong base.
Mixing rubidium hydroxide with water produces rubidium hydroxide solution. Rubidium hydroxide is a strong base that ionizes in water to give rubidium cations and hydroxide anions.
The pH level of aluminum hydroxide is around 9-10, making it slightly basic.
Rubidium hydroxide will turn red litmus paper blue. This is because rubidium hydroxide is a strong base that will readily accept protons from the red litmus paper, causing a color change to blue indicating a basic solution.
Sodium hydroxide typically has a higher pH level than potassium hydroxide. Sodium hydroxide has a pH around 14, while potassium hydroxide has a pH around 12.
The pH level of calcium hydroxide is around 12-13, making it alkaline.