why there no color change in Glycine when mix with HNO and NAOH
When glycine is mixed with HNO₃ (nitric acid) and NaOH (sodium hydroxide), there is generally no noticeable color change. This is because glycine is an amino acid and does not contain any chromophores or groups that are capable of absorbing visible light and displaying color.
To understand why there is no color change, let's break down the reactants:
1. Glycine: Glycine is an organic molecule that is composed of an amino group (-NH₂), a carboxyl group (-COOH), and a hydrogen atom (-H) attached to a central carbon atom. It is a simple, colorless, and non-aromatic compound.
2. Nitric acid (HNO₃): Nitric acid is a strong acid and dissociates into hydrogen ions (H⁺) and nitrate ions (NO₃⁻) in water. While nitric acid itself is colorless, the hydrogen ions it produces can sometimes affect the color of substances it reacts with. However, glycine is not affected by the hydrogen ions in nitric acid.
3. Sodium hydroxide (NaOH): Sodium hydroxide is a strong base that dissociates into sodium ions (Na⁺) and hydroxide ions (OH⁻) in water. Like nitric acid, sodium hydroxide does not have any inherent color.
When glycine is mixed with nitric acid and sodium hydroxide, the reaction can result in the formation of glycine salt, such as sodium glycinate (Na⁺C₂H₄NO₂⁻). However, this reaction does not involve any color-producing or color-changing processes.
In summary, the lack of color change when glycine is mixed with nitric acid and sodium hydroxide is due to the absence of chromophores in glycine and the nature of the reaction that takes place.