In this activity, we will prepare a solution of sodium chloride in water with a known concentration of 10g/L. This activity helps us understand the concept of concentration and the process of making a uniform solution.
NIOS Class 10 Science and Technology Project File
This activity is based on the NIOS class 10 science
and technology chapter 2, Matter in Our Surroundings.
Preparation of a Sodium Chloride Solution of Known Concentration
Aim of the activity
To prepare a solution of NaCl in water having a concentration
of 10 g/L by mass.
Material used in the activity
1. Graduated flask
2. Distilled water
3. Weighing machine
4. Sodium chloride
5. Glass rod
Procedure
We take a graduated flask and fill it with half distilled water, which is a solvent. Now we weigh 10 grams of sodium chloride
and add it to the flask. After that, we stir
the solution with a glass rod.
Once the sodium chloride (solute) is fully dissolved,
we add more distilled water until the total volume of the solution reaches 1000
mL(1.0 dm3). Finally, we shake the flask again to ensure the solution
is uniform.
Observation
We can see that sodium chloride completely dissolves
in distilled water and forms no residue. The final solution appears clear and
transparent. The concentration of the solution is 10 grams per litre.
Explanation
A solution is formed when a solute dissolves uniformly
in a solvent.
Sodium chloride (solute) dissolves in water (solvent)
to form a homogeneous solution. The final concentration of concentration of 10
g/L means each litre of solution contains 10 grams of salt.
Conclusion
This activity demonstrates the method of preparing a
solution with a known concentration.
Frequently Asked Questions
1. What does 10g/L mean?
Answer – It means there are 10 grams of solute in
every litre of solution.
2. Why do we use distilled water in this activity?
Answer – Because distilled water is free from impurities
and other ions.
3. What is the formula of sodium chloride?
Answer - NaCl
4. Is this solution of sodium chloride safe to drink?
Answer – No, lab-prepared solutions are not meant for
consumption.
5. What is a solute?
Answer - The solid that dissolves is called a solute. It
is present in small quantities in a solution.
6. What is a solvent?
Answer – The liquid in which the solid is dissolved is
called a solvent. It is present in large quantities in a solution.
7. What is a solution?
Answer – A solution is a homogeneous mixture formed
when a solute dissolves in a solvent uniformly.
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