What is Specific Gravity?

[andyjl]

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I see this every now and then in Kaplan.. THis problem is from the integrated workshop of kaplan #58

An aqueous sulfuric acid solution is 39.2% H2SO4 by mass and has a specific gravity of 1.25. HOw many milimeters of this solution are required to make 100 ml of a 0.20 M sulfuric acid solution (FW H2S04 = 98 g/mol)

What is specific gravity and how do you solve this?

 

[legoland]

I see this every now and then in Kaplan.. THis problem is from the integrated workshop of kaplan #58

An aqueous sulfuric acid solution is 39.2% H2SO4 by mass and has a specific gravity of 1.25. HOw many milimeters of this solution are required to make 100 ml of a 0.20 M sulfuric acid solution (FW H2S04 = 98 g/mol)

What is specific gravity and how do you solve this?

Specific gravity is simply the density of an object in concern relative to the density of water. And since it's a ratio of two compatible units, it will end up a dimensionless quantity.

This problem is best solved when working backward with the figures given:

(0.2 mol H2SO4/1 L) * 0.1 L * (98 g H2SO4/1 mol H2SO4) * [1 ml H2SO4 aq/(1.25 * 0.392) g H2SO4] = 4 ml H2SO4 aq