Question

what is the Ph value of ammonia? please do it with steps

Answer 1

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Ammonia (NH3) is a gas that readily dissolves in water and behaves as a base. The ammonia equilibrium is describe with the equation NH3 + H2O = NH4(+) + OH(-). Formally, the acidity of the solution is expressed as pH. This is the logarithm of the concentration of hydrogen ions (protons, H+) in the solution. Base dissociation constant (Kb) is defined as Kb = [NH4+][OH-]/[NH3]. (Brackets refer to the molar concentration of ions or molecules in the solution.) Kb is a constant at a given temperature and is usually tabulated at 25 degrees Celsius. The Kb value for ammonia is 1.8E-5 (the notation “E-5” means “ten in power -5”).

Multiply the Kb value by the total ammonia concentration and the number 4. The total concentration is the sum of [NH4+] and [NH3] in the solution. This concentration must be known or given in order to calculate pH. For example, the concentration is equal to 0.1 molar. Then the value in this Step should be calculated as 1.8E-5 x 0.1 x 4 = 7.2E-6.

Take the square root of the value obtained in Step 1. In the example, it is sqrt(7.2E-6) = 2.683E-3. (Note that this result is rounded to thousandths.)

Answer 2

Ammonia is a compound of nitrogen and hydrogen with the formula NH3. .... Shifts in pH will cause more or fewer ammonium cations (NH + 4) and amide anions (NH − 2).