Compare solubility of salt, sugar and chalk | Solutions | Chemistry

Summary

This video explains the concept of solubility in liquids, highlighting how the ability of a substance to dissolve depends on its chemical makeup. The experiment tests the solubility of salt, sugar, chalk, starch, and baking powder in water. While salt, sugar, and baking powder dissolve, chalk and starch remain insoluble. The video also discusses the textures of soluble and insoluble substances, noting that crystalline substances tend to dissolve while powdery ones do not. An intriguing question is posed about why spinach doesn't dissolve in water, but its juice does, sparking curiosity.

Takeaways

• 💧 Solubility in a liquid is a unique property that depends on the chemical makeup of the substance.
• ✔️ A substance that dissolves in a liquid is considered soluble, while one that doesn’t dissolve is considered insoluble.
• 🔍 The experiment tests the solubility of salt, sugar, chalk, starch, and baking powder in water.
• 🧪 Required materials for the activity include beakers of water, a stirrer, and the substances to be tested.
• 👁️ Observations include noting the colors, texture (coarse or fine grains), and the solubility of each substance in water.
• 🌀 Salt, sugar, and baking powder dissolve in water, while starch and chalk powder do not.
• 📊 Substances that dissolve in water tend to be crystalline with a grainy texture.
• ❌ Insoluble substances, like chalk and starch, are powdery and dry in texture.
• 🥬 Spinach leaves do not dissolve in water, but spinach juice does and mixes evenly.
• ❓ The script ends by asking the viewer why spinach juice dissolves in water but spinach itself does not.

Q & A

What determines the solubility of a substance in a liquid?

The solubility of a substance in a liquid depends on the chemical makeup of the substance.

What is meant by a substance being soluble in a liquid?

A substance is said to be soluble in a liquid if it can dissolve in that liquid.

What does it mean when a substance is termed as insoluble?

A substance is termed as insoluble when it fails to dissolve in a liquid.

Which substances were tested for solubility in water in the activity?

The substances tested for solubility in water were salt, sugar, chalk, starch, and baking powder.

What observations should be made about the substances before adding them to water?

Before adding the substances to water, their colors should be observed, and their textures should be felt to determine if they have coarse or fine grains.

Which of the tested substances dissolved in water?

Salt, sugar, and baking powder dissolved in water.

Which of the tested substances did not dissolve in water?

Starch and chalk powder did not dissolve in water.

What characteristics were noted about substances that dissolve in water?

Substances that dissolve in water are typically crystalline and have a grainy texture.

What characteristics were noted about substances that do not dissolve in water?

Substances that do not dissolve in water usually have a powdery and dry texture and are not crystalline.

Why does spinach not dissolve in water, while spinach juice does?

Spinach does not dissolve in water because it is not in a soluble form, while spinach juice, which contains soluble components, can dissolve and mix evenly in water.