Lesson Plan of Properties together with uses of Salt
General Science Grade VIII
Students’ Learning Outcomes
· Define the term salt.
· Describe the properties of salts.
· Explain the uses of salts inwards daily life.
Information for Teacher
· A common salt is a chemical compound formed past times the neutralization reaction betwixt an acid together with a base.
· Salts of calcium, introduce inwards our bones are responsible for strengthening of bones.
· Potash alum is used for the purification of water.
· Salts of iodine are needed for the proper performance of thyroid gland. they are every bit good used for the handling of goiter.
· salts ionize inwards H2O e.g., Na CI dissociates into Na’& CI
Uses of Salts
Sr. | SALT | USE |
1 | Ammonium Chloride | In torch batteries |
2
Ammonium Nitrate
In fertilizers
3
Calcium Chloride
As Drying Agent
4
Iron Sulfate
In Iron Tablets
5
Magnesium Sulfate
In Medicine
6
Potassium Nitrate
In Gunpowder etc.
7
Silver Bromide
In Photography
8
Sodium Chloride
Making Na OH
9
Sodium Stearne
In Making Soap
· Salt solutions are every bit good used every bit electrolytes together with every bit fertilizers.
· Salts are used for seasoning food.
· Salts such every bit baking soda are used to soften breadstuff & cake.
Properties of Salt | |
Name of Compound | Sodium Chloride |
Chemical Formula | Na CI |
Formula weight | 58.443 |
Color | Colorless or white when pure; colored splotches (e.g. Blue, purple) when impure. |
Luster | Vitreous |
Physical shape | Transparent to translucent cubic crystal; every bit good pulverisation or granules |
Mos hardness | 2 1/2 |
Density at O* C(32*f) | 2.17 g/cm |
Melting bespeak | 801* C (1,474*F) |
Boiling bespeak | 1,465* C (2, 669* F) |
Solubility | Water (S)*; glycerol (S); alcohol (SS) hydro chloride acid |
Concept Map
Material / Resources
Vinegar, sodium hydroxide, beakers, pH papers, burner/spirit lamp
Worm upward activity
· Write the give-and-take “salts” on the board & enquire students to hand their ideas almost it. write students ideas on the board.
·
Development
Activity 1
· divide students inwards little groups together with learn them to:
o Take little total of sodium hydroxide inwards beaker A.
o Add few drops of phenomenological to it. Solution volition plough pink.
o Take vinegar inwards beaker B together with add together it drib wise to beaker Influenza A virus subtype H5N1 until it becomes colorless.
o Dip pH newspaper later each add-on together with thence evaporate the solution mixture to dryness.
· Ask students to write answers of next questions inwards their journals.
o What is the refer of procedure when alkali is added inwards acid?
(Expected response: Neutralization)
o What did you lot larn later solution mixture is evaporated?
(Expected response: Salt crystals)
o Can you lot refer the solid production obtained later evaporation?
(Expected response: Sodium acetate)
Activity 2
· Divide students inwards little groups & learn them to:
o Dissolve washing soda (Sodium carbonate) inwards H2O inwards beaker A.
o Dissolve baking soda baking soda (sodium bicarbonate) inwards H2O inwards beaker B.
o Dissolve mutual common salt inwards H2O inwards beaker C. dip pH newspaper inwards all the 3 solutions.
Observation:
o What alter inwards color of pH newspaper is observed inwards all the 3 solutions?
o What is the nature of the solutions inwards beaker A, B together with C?
· The beaker ‘A’ volition hand value of pH to a greater extent than than 7. (Basic salt) the beaker ‘B’ volition hand value of pH less than 7. (acidic salt) the beaker ‘C’ volition hand value of pH equal to
Sum upward / Conclusion
· Conclude the lesson past times telling students:
o Salts are formed every bit a effect of neutralization reaction betwixt an acid together with base.
o Salts are of nifty exercise together with are every bit good flora inwards human body.
o Salts are crystalline together with soluble inwards water.
Assessment
· Assess students’ Learning past times bespeak these questions:
o Explain the role of baking soda inwards the procedure of baking?
(Expected response: Baking soda produces carbon dioxide which raises the baking material.
o Which salts are used every bit fertilizers inwards dissimilar crops?
o Calcium phosphate, DAP or ammonium sulfate.
Follow up
· Visit the Khewra Mines:
Read the province of affairs below together with hand appropriate answers to the, “ Khewra Mine Guide”, inquiry based upon your of late developed cognition almost salts.
A grouping of students visited Khewra mines, where the guide told them few interesting facts almost mine:
Fact 1:
· There are little ponds. if anyone jumps into the water, he/she volition never drowned. Can you lot say the reason?
A1: the somebody volition non drown simply tin endure from severe dehydration.
Fact2:
· If you lot come upward inwards winter, you lot volition never experience cold. What you lot think, why is it so?
A2: Salts are bad conductors of heat.
Solve the mystery
· One morning time a watchman’ torso was flora lying on the flooring of a warehouse. Nader was suspected murdering the watchman. Police flora white pulverisation inwards his socks. They said it was slaked lime from ware solid where his torso was found. But Nader insisted that he has been defendant wrongly every bit he was on the salty beach final night. The pulverisation inwards his socks was salt. What tests would you lot ship out to give away out if Nader was telling the truth?
Answer: pH of common salt together with slaked lime could live checked. salts are neutral piece slaked lime is highly basic.
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