HOW TO GET WAEC 2024 MATHEMATICS QUESTIONS AND ANSWERS
| 2024 WAEC EXPO | WAEC CHEMISTRY PRACTICAL ALTERNATIVE B 2024 |
|---|---|
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Here Are 2023 WAEC Chemistry Alternative B Practical Solutions:
(3a)
To determine the volume of water that should be added, we can use the formula for dilution:
M1V1 = M2V2
Where:
M1 = initial molarity of the solution
V1 = initial volume of the solution
M2 = final molarity of the solution
V2 = final volume of the solution
Given:
M1 = 0.5 mol/dm³
V1 = 100 cm³ (or 0.1 dm³)
M2 = 0.3 mol/dm³
V2 = ? (volume of water to be added)
Rearranging the formula, we have:
V2 = (M1 * V1) / M2
Substituting the given values, we get:
V2 = (0.5 mol/dm³ * 0.1 dm³) / (0.3 mol/dm³)
= (0.05 mol) / (0.3 mol/dm³)
= 0.1667 dm³
Therefore, approximately 0.1667 dm³ (or 166.7 cm³) of water should be added to 100 cm³ of 0.5 mol/dm³ HCl in order to obtain 0.3 mol/dm³ HCl.
(3b)
One possible chemical test to distinguish between dilute HCl and dilute HNO3 is to use silver nitrate (AgNO3) solution.
When a few drops of dilute HCl are added to a solution of AgNO3, no visible reaction occurs. However, when a few drops of dilute HNO3 are added to a solution of AgNO3, a white precipitate of silver chloride (AgCl) is formed.
The relevant equation for the reaction between dilute HNO3 and silver nitrate is:
HNO3 + AgNO3 -> AgCl + HNO3
The formation of the white precipitate of silver chloride indicates the presence of HNO3, while the absence of any reaction indicates.
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