# How do you calculate Ka in chemistry?

## How do you calculate Ka in chemistry?

Dissociation Constant for Acetic Acid As noted above, [H3O+] = 10-pH. Since x = [H3O+] and you know the pH of the solution, you can write x = 10-2.4. It is now possible to find a numerical value for Ka. Ka = (10-2.4)2 /(0.9 – 10-2.4) = 1.8 x 10-5.

### How do you calculate Ka from concentration?

Equilibrium Concentration

1. Step 2: Create the Ka equation using this equation: Ka=[Products][Reactants]
2. Ka=[H3O+][OBr−][HOBr−] Step 3: Plug in the information we found in the ICE table.
3. Ka=(x)(x)(0.2−x) Step 4: Set the new equation equal to the given Ka. 2×10−9=(x)(x)(0.2−x) Step 5: Solve for x. x2+(2×10−9)x−(4×10−10)=0.

What is the Ka of HCL?

Ka Acid Base
1.3 * 106 Hydrochloric acid Chloride
1.0 * 103 Sulfuric acid Hydrogen sulfate ion
2.4 * 101 Nitric acid Nitrate ion
——– Hydronium ion Water

Can Ka be negative?

As Kc and Ka are the ratios of product concentration divided by the reactant concentration, neither of those values can be negative. Therefore,the value of Kc and Ka value cannot be negative.

## How do you calculate Ka value?

Chemists determine the strength of an acid (Ka) by measuring the concentrations of HA, H 30 + and A – at equilibrium and dividing the concentrations of the products by the concentration of the original acid. Because the concentration of water is a constant, they leave it out of the equation. Ka = [H 3O +] [A -]/[HA]

### What is the chemical equation for Ka?

The Ka expression is Ka = [H3O+][C2H3O2-] / [HC2H3O2].

Why are Ka values all small numbers?

Almost all Ka values in general are smaller numbers. The reason is that K values represent very weak acids.

What is the equation for Ka?

The numerical value of Ka is used to predict the extent of acid dissociation. A large Ka value indicates a stronger acid (more of the acid dissociates) and small Ka value indicates a weaker acid (less of the acid dissociates). For a chemical equation of the form HA + H2O ⇋ H3O + + A −