Question

Сравнить свойства аминоуксусной кислоты со свойствами амфотерного цинк гидроксида. составить уравнения реакций

Answer 1

Взаимодействие со щелочами
NH2-CH2COOH+KOH = NH2-CH2COOK+H2O
Zn(OH)2+2KOH = K2[Zn(OH)2]
Взаимодействие с кислотами
NH2-CH2COOH+HCl = (Cl)NH3-CH2COOH
Zn(OH)2+2HCl = ZnCl2+2H2O

Answer 2

Properties of Aminoacetic Acid (Glycine)

Aminoacetic acid, also known as glycine, is the simplest amino acid with the chemical formula NH2CH2COOH. It is a non-essential amino acid, meaning that it can be synthesized by the human body and is not required to be obtained from the diet. Here are some key properties of aminoacetic acid:

1. Physical Properties: - Aminoacetic acid is a white, crystalline solid at room temperature. - It has a sweet taste and is soluble in water. - The melting point of glycine is around 232-236°C.

2. Chemical Properties: - Aminoacetic acid is amphoteric, which means it can act as both an acid and a base. It can donate a proton (H+) or accept a proton depending on the reaction conditions. - In acidic conditions, glycine can donate a proton from its carboxylic acid group (COOH) and act as an acid. - In basic conditions, glycine can accept a proton on its amino group (NH2) and act as a base. - The amphoteric nature of glycine allows it to participate in various chemical reactions.

Properties of Amphoteric Zinc Hydroxide

Zinc hydroxide (Zn(OH)2) is an amphoteric compound, meaning it can exhibit both acidic and basic properties. Here are some key properties of amphoteric zinc hydroxide:

1. Physical Properties: - Zinc hydroxide is a white, gelatinous solid. - It is sparingly soluble in water and forms a colloidal suspension when dispersed in water. - The compound can be obtained as a precipitate by adding a strong base to a solution containing a zinc salt.

2. Chemical Properties: - Zinc hydroxide can act as both an acid and a base. - In acidic conditions, it can react with strong bases to form zincates, such as zincate ion (Zn(OH)4^2-). - In basic conditions, it can react with strong acids to form zinc salts, such as zinc chloride (ZnCl2). - The amphoteric nature of zinc hydroxide allows it to participate in various chemical reactions.

Reactions of Aminoacetic Acid and Amphoteric Zinc Hydroxide

The reactions involving aminoacetic acid (glycine) and amphoteric zinc hydroxide can be summarized as follows:

1. Reaction of Aminoacetic Acid as an Acid: - When aminoacetic acid acts as an acid, it can donate a proton from its carboxylic acid group (COOH). For example, it can react with a strong base like sodium hydroxide (NaOH) to form sodium glycinate and water: ``` NH2CH2COOH + NaOH → NH2CH2COONa + H2O ```

2. Reaction of Aminoacetic Acid as a Base: - When aminoacetic acid acts as a base, it can accept a proton on its amino group (NH2). For example, it can react with a strong acid like hydrochloric acid (HCl) to form glycine hydrochloride: ``` NH2CH2COOH + HCl → NH2CH2COOHCl ```

3. Reaction of Amphoteric Zinc Hydroxide as an Acid: - When amphoteric zinc hydroxide acts as an acid, it can donate a proton to a strong base. For example, it can react with sodium hydroxide (NaOH) to form sodium zincate and water: ``` Zn(OH)2 + 2NaOH → Na2ZnO2 + 2H2O ```

4. Reaction of Amphoteric Zinc Hydroxide as a Base: - When amphoteric zinc hydroxide acts as a base, it can accept a proton from a strong acid. For example, it can react with hydrochloric acid (HCl) to form zinc chloride and water: ``` Zn(OH)2 + 2HCl → ZnCl2 + 2H2O ```

These reactions demonstrate the amphoteric nature of both aminoacetic acid and zinc hydroxide, allowing them to participate in various acid-base reactions.

Please note that the reactions provided are simplified representations and may not account for specific reaction conditions or stoichiometry.