Suppose the density of 100.0 mL of some liquid was found to be .78 g/mL . What would be the specific gravity of 25.0 mL of the liquid?
To reiterate, the density of something does NOT change with volume. The density of 25 mL is the same as the density of 100 mL and that's the same as a zillion gallons of the stuff.
specific gravity = density.
But it is saying the soecifc gravity of 25.0 mL of the liquid so the density changes. That's what threw me off... It wouldn't equal the density
The specific gravity of 25 mL is the same as the specific gravity of 20000000 mL. Specific gravity is specific gravity and density is density. density = mass/volume. The larger the mass the larger the volume and the quotient is the same.
To find the specific gravity of a liquid, you need to compare its density to the density of a reference substance. In most cases, the reference substance is water at a temperature of 4 degrees Celsius.
The specific gravity (SG) is defined as the ratio of the density of the liquid to the density of the reference substance. Mathematically, it can be calculated as:
SG = density of the liquid / density of the reference substance
In this case, to find the specific gravity of 25.0 mL of the liquid, we need to calculate the density of the liquid first. Given that the density of 100.0 mL of the liquid is 0.78 g/mL, we can use the following formula to calculate the density:
density = mass / volume
Since we know the volume (25.0 mL) and want to find the mass, we can rearrange the formula to solve for the mass:
mass = density * volume
Substituting the known values, we have:
mass = 0.78 g/mL * 25.0 mL
mass = 19.5 grams
Now that we know the mass of the liquid (19.5 grams), we can calculate its density:
density = mass / volume
density = 19.5 g / 25.0 mL
density = 0.78 g/mL
Finally, we can find the specific gravity by dividing the density of the liquid (0.78 g/mL) by the density of the reference substance (water at 4 degrees Celsius, which is 1 g/mL):
specific gravity = 0.78 g/mL / 1 g/mL
specific gravity = 0.78
Therefore, the specific gravity of 25.0 mL of the liquid is 0.78.