## 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

- Step 2: Create the Ka equation using this equation: Ka=[Products][Reactants]
- Ka=[H3O+][OBr−][HOBr−] Step 3: Plug in the information we found in the ICE table.
- 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 −