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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Determination of True Density of a Pharmaceutical Powder Sample using Solvent Displacement Method

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1. The main reason for using a pycnometer in true density measurement is:

a: It has a larger capacity Explanation

Explanation

b: It is made of glass Explanation

Explanation

c: It allows accurate volume measurement by minimizing void spaces Explanation

Explanation

d: It gives bulk density directly Explanation

Explanation

2. If the powder partially dissolves in the solvent, the measured density will be:

a: Correct Explanation

Explanation

b: Lower than the actual true density Explanation

Explanation

c: Higher than the actual true density Explanation

Explanation

d: Unchanged Explanation

Explanation

3. The difference (W₂ – W₁) represents:

a: Weight of powder Explanation

Explanation

b: Weight of liquid required to fill the pycnometer Explanation

Explanation

c: Weight of displaced liquid Explanation

Explanation

d: Volume of powder Explanation

Explanation

4. The mass of displaced liquid is calculated using:

a: (W₃ – W₁) Explanation

Explanation

b: (W₄ – W₃) Explanation

Explanation

c: (W₂ – W₁) – (W₄ – W₃) Explanation

Explanation

d: (W₁ – W₂) Explanation

Explanation

5. Maintaining constant temperature during the experiment is important because:

a: It affects solubility only Explanation

Explanation

b: It prevents solvent evaporation Explanation

Explanation

c: Liquid density changes with temperature affecting accuracy Explanation

Explanation

d: It helps in mixing the powder Explanation

Explanation

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