Search results
Results from the WOW.Com Content Network
The \ (K_\text {a}\) and \ (K_\text {b}\) values have been determined for a great many acids and bases, as shown in Tables 21.12.2 and 21.13.1. These can be used to calculate the pH of any solution of a weak acid or base whose ionization constant is known.
Calculate the pH of a solution of a weak monoprotic weak acid or base, employing the "five-percent rule" to determine if the approximation 2-4 is justified. Predict whether an aqueous solution of a salt will be acidic or alkaline, and explain why by writing an appropriate equation.
The pH of a solution of a weak base can be calculated in a way which is very similar to that used for a weak acid. Instead of an acid constant Ka, a base constant Kb must be used.
To summarize calculating the pH of a weak base, follow these steps: 1) Write the equation for the reaction of the base with water. 2) Assign x mol/l for the concentration of the base that reacts with water. 3) Make an ICE table. 4) Use the equilibrium concentration from the ICE table to set up an equation and solve for the x.
The Henderson-Hasselbalch equation is: For weak acids: pH = pKa + log ( [A–]/ [HA]) For weak bases: pH = pKa + log ( [B]/ [BH+])
pH Calculation Formula. The formula to calculate pH is: pH = -log [H+] The brackets [] refer to molarity, M. Molarity is given in units of moles per liter of solution. In a chemistry problem, you may be given concentration in other units. To calculate pH, first convert concentration to molarity.
The pH calculator can determine the pH from H⁺ molar concentration, or Ka, and the concentration of a solution.
Calculating pH of Weak Acid and Base Solutions. The \(K_\text{a}\) and \(K_\text{b}\) values have been determined for a great many acids and bases, as shown in Tables 21.12.2 and 21.13.1. These can be used to calculate the pH of any solution of a weak acid or base whose ionization constant is known.
Summary. The procedure for calculating the pH of a weak acid or base is illustrated. Practice. Perform the calculations at the site below:
Weak Base pH Formula only partially break down into their component ions in an aqueous solution; they’re called weak electrolytes and poor conductors of electricity. Bases are substances that dissolve in water to form OH- ions and accept hydrogen ions from acids. They cause red litmus paper to turn blue and taste bitter when touched.