- Calculate the pH of 0.10 M HCl solution?
- pH of salt solutions
- How to Calculate the pH of a Weak Acid
Calculate the pH of 0.10 M HCl solution?
Find the pH: NH3 and HCl (Titration: Strong Acid/Weak Base)the get how the
The pH of a solution is a measure of the hydrogen ions, or protons, present in that solution. Because acids are proton donors, in everyday terms, you can say that a solution containing a "strong acid" that is, an acid with a high propensity to donate its protons is "more acidic. In chemical terms, this is because the pH of hydrochloric acid is lower. Importantly, when this comparatively weak acid dissolves in solution, all three molecules exist in varying proportions. The extent to which any acid gives off protons is the extent to which it is ionized, and this is a function of a property of the acid known as its K a , which you can find in tables online or in books. If, for example, you have a 0.
We can rank the strengths of acids by the extent to which they ionize in aqueous solution. The reaction of an acid with water is given by the general expression:. The relative strengths of acids may be determined by measuring their equilibrium constants in aqueous solutions. In solutions of the same concentration, stronger acids ionize to a greater extent, and so yield higher concentrations of hydronium ions than do weaker acids. The equilibrium constant for an acid is called the acid-ionization constant, K a. For the reaction of an acid HA:. Although water is a reactant in the reaction, it is the solvent as well, so we do not include [H 2 O] in the equation.
Adding a base does the opposite. Regardless of what is added to water, however, the product of the concentrations of these ions at equilibrium is always 1. Data from this table are plotted in the figure below over a narrow range of concentrations between 1 x 10 -7 M and 1 x 10 -6 M. It is impossible to construct a graph that includes all the data from the table given above. In , the Danish biochemist S. By definition, the logarithm of a number is the power to which a base must be raised to obtain that number.
pH of salt solutions
How to Calculate the pH of a Weak Acid