What is the Ka value of ammonia?
5.8
| Ka | Acid | Base |
|---|---|---|
| 6.2 * 10-10 | Hydrocyanic acid | Cyanide ion |
| 5.8 * 10-10 | Ammonium ion | Ammonia |
| 5.8 * 10-10 | Boric acid | Dihydrogen carbonate ion |
| 4.7 * 10-11 | Hydrogen carbonate ion | Carbonate ion |
What is Ka for NH4?
Question: The Ka of NH4+ is 5.6 × 10−10.
What is the pKa of the ammonium ion NH4+?
9.2
Ammonium ion (NH4+) has a pKa of 9.2.
What does a pKa of 10 mean?
A strong acid will have a pKa of less than zero. More precisely – pKa is the negative log base ten of the Ka value (acid dissociation constant). The lower the value of pKa, the stronger the acid and the greater its ability to donate its protons.
What is the pKa of ammonium?
9.3
pKa Values for Organic and Inorganic Bronsted Acids at 25 oC
| Name | pKa |
|---|---|
| Ammonium ion | 9.3 |
| Hydrogen cyanide | 9.3 |
| Hexaflurorisopropanol | 9.3 |
| Phenol | 9.9 |
How do you find h from pH?
Key Concepts
- The hydrogen ion concentration in a solution, [H+], in mol L-1, can be calculated if the pH of the solution is known.
- pH is defined as the negative logarithm (to base 10) of the hydrogen ion concentration in mol L-1 pH = -log10[H+]
- [H+] in mol L-1 can be calculated using the equation (formula): [H+] = 10-pH
What is the formula for PKA?
To create a more manageable number, chemists define the pKa value as the negative logarithm of the Ka value: pKa = -log Ka . If you already know the pKa value for an acid and you need the Ka value, you find it by taking the antilog. In practice, this means raising both sides of the equality to exponents of 10.
What is the Ka of NH4?
The Ka of NH4+ is 5.6 × 10−10. The Kb of CN− is 2 × 10−5.
What is pKa value for sodium hydroxide?
Sodium hydroxide is a strong base with a 13.8 pKa value. Sodium hydroxide has a chemical formula of NaOH and is also referred to as lye or caustic soda. Other defensible answers are 14 and 15.7 strangely enough.
What is PKA in chemistry?
pKa is by definition a -log(Ka), where Ka is the dissociation constant of an acid. Let’s look at the most iconic acid in chemistry: hydrochloric acid (HCl): In this reaction, HCl dissociates giving you a proton/hydronium ion (depending on the media) and chloride anion.