Stoichiometry And Stoichiometric Calculations
Chapter Name : Some Basic Concepts Of Chemistry |
Sub Topic Code : 102_11_01_10_03 |
Topic Name : Stoichiometry And Stoichiometric Calculations |
|
Sub Topic Name : Reactions In Solutions |
|
Introduction
• Majority of reactions take place inside solutions, therefore it’s important to know the concentrations of these solutions. • The concentration of a solution is expressed in 4 ways : 1) Mass percent (w/w %) 2) Mole fraction 3) Molarity 4) Molality
Pre-Requisites:
Mass, atom, element, compound, molar mass, chemical formula, molar conversion.
Activity:
Solutions, such as cleaning solutions, come in different concentrations. Eg. Dettol
Real Life Question:
How do you make exact concentration of dilute solution from a concentrated solution?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Solution | A solution is made up of the solute and the solvent. Its concentration is expressed in many ways. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Take a concentrated juice solution | Make different concentration of solutions from the concentrate by adding different quantities of water. |
Real life uses :
Making juice from a concentrate.
Places to visit :
Kitchen, bathroom
Practical examples around us
| Examples | Explainations |
|---|---|
| Dettol concentrate | Dettol solution for e.g. is diluted at times to clean wounds. This is done by adding water to it. |
What you learn in Theory:
Solutions come in varying concentrations and can be expressed in various forms.
What you learn in Practice:
Exact amount of solute is required to dilute a solution. Calculating concentrations makes it helpful to understand how much of water needs to be added.