The buoyancy method can be used to determine the densities of high melting or co

Question

The buoyancy method can be used to determine the densities of high melting or corrosive liquids. A platinum sinker suspended by a thin platinum wire from a balance weighed 58.35 g in air. When it was completely immersed in water at room temperature, the apparent weight of the sinker was 49.26 g. The sinker was dried and immersed in a crucible containing molten potassium tungstate at 925 degree C. Its new apparent weight was 30.17 g. Use the data given to determine the density of molten potassium tungstate at 925 degree C.

Explanation / Answer

Given

Exact weight of Platinum wire = 58.35 g

apparent weight of sinker in water = 49.26 g

Specific gravity of platinum wire = weight of platinum wire / apparent weight in water = 58.35 g / 49.26 g = 1.1845

apparent weight of sinker in molten potassium = 30.17 g

specific gravity of potassium =( apparent weight in molten potassium / normal weight of platinum wire ) * Specific gravity of platinum wire   = (30.17 / 58.35 g) * 1.1845 = 0.612

density of molten potassium at 925 C = 612 Kg/m3 Answer

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