What is acid-base equilibria?
The state that exists when acidic and basic ions in solution exactly neutralize each other.
How do you determine acid-base equilibrium?
Therefore, to predict the position of the equilibrium, follow these steps:
- Identify the acid and the conjugate acid of the base:
- Look up the pKa values of the acid the conjugate acid:
- Write the reaction equation pointing the equilibrium position with a longer arrow:
How is equilibrium related to acids and bases?
In any acid-base reaction, the equilibrium will favor the reaction that moves the proton to the stronger base. This equilibrium constant is referred to as the ion-product constant for water, Kw. At 25°C, Kw = 1.0 × 10−14 Water is amphoteric. In pure water, some molecules act as bases and some as acids.
What is the importance of acid-base equilibrium in daily life?
Acids and bases are important to many chemical processes: maintaining a stable internal environment in the human body, baking a delicious cake, or determining whether a lake can support aquatic life. Reactions involving acids and bases can be described through the transfer of protons – single H+ ions.
Is negative pH possible?
Can You Detect A Negative pH? While the pH scale typically runs from 0 to 14, it is definitely possible to calculate a negative pH. A negative pH occurs when the molarity of hydrogen ions in a strong acid is greater than 1 N (Normality).
Is phenolphthalein pink in acid?
Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.
What colour is acid?
Universal indicator
| pH range | Description | Colour |
|---|---|---|
| < 3 | Strong acid | Red |
| 3–6 | Weak acid | Orange or Yellow |
| 7 | Neutral | Green |
| 8–11 | Weak alkali | Blue |
What color is methyl red?
dark red
It is an azo dye, and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pKa of 5.1.