Density and Gravity

Question 1

how to find density

Answer 1

d= mass in g / volume in mL

Question 2

how to find sg

Answer 2

sg = weight of given substance / weight of equal volume of water

Question 3

how to calculate volume by weight and sg

Answer 3

mL = g / sg

Question 4

how to calculate weight by volume and sg

Answer 4

g = mL x sg

Question 5

example: what is sg of an oil if 54.96mL of the oil weights 52.78

Answer 5

using sg equation
52.78/54.96 = 0.9603

Question 6

example: what is the density of an acid that is 10mL if the acid weighs 18g

Answer 6

using d=m/v
18/10 = 1.8

Question 7

example: what is the volume in mL of 492g of nitric acid with sg of 1.40

Answer 7

using mL = g / sg
492/1.40 = 351.43 mL

Question 8

example: 50mL pycnometer is found to weigh 120g when empty, 171 g when filled with water and 160g when filled with unknown liquid what is the SG?

Answer 8

use weight of given substance / weight of equal volume of water.
- find the sg for both water and unknown liquid
w of water = 171-120=51g
w of unknown = 160-120=40g
sg=40/51 = 0.78