Αποτελέσματα Αναζήτησης
15 Απρ 2024 · 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.
18 Ιουλ 2023 · In general the pH of a solution of a weak acid depends on only two factors, the concentration of the acid, c a, and the magnitude of an equilibrium constant K a, called the acid constant, which measures the strength of the acid. The acid constant is defined by the relationship:
The pH range is commonly given as zero to 14, ... Water itself is a weak acid and a weak base, so its dissociation must be taken into account at high pH and low solute concentration (see amphoterism). It dissociates according to the equilibrium 2 H 2 O ⇌ H 3 O + (aq) + OH ...
28 Απρ 2021 · 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.
pH of a Weak Acid. Determining the pH of a weak acid is more complex compared to what we saw for strong acids, because for a weak acid, the dissociation is not 100%, and therefore, the [H+] is not the same as [HA]. For example: Calculate the pH of 3.5 M solution of HCN. Ka (HCN) = 4.9 x 10 -10.
The pH of a weak acid at the end-point (equivalence) lies above pH 7. At equivalence, the solution contains the salt of a weak acid: this is a base (the conjugate base of the weak acid) and so the solution is basic.
4 Μαΐ 2021 · pH is the most common way to represent how acidic something is. The pH scale is a handy way of making comparisons of how much acidic solutions are, for example. So how does the scale work? The pH Equation. To calculate pH all you need is the H + ion concentration and a basic calculator, because it is a very straightforward calculation.
