(1)What is the name of the method you will use to weigh out the calcium chloride
ID: 884461 • Letter: #
Question
(1)What is the name of the method you will use to weigh out the calcium chloride needed to make your solution?
(2)A student collects the following data in Part A. Calculate the concentration of the calcium chloride solution they make.
Mass of weigh bottle + CaCl2·2H2O: 14.512 g
Mass of weigh bottle after transferring CaCl2·2H2O: 10.651 g
Size of volumetric flask: 250 mL
Concentration =
(3)A student collects the following data in Part B. Calculate the density of the solution they are analyzing.
Volume of pipette: 25.00 mL
Mass of empty, dry bottle: 12.547 g
Mass of bottle + aliquot of solution: 38.535 g
density =
Explanation / Answer
first one i am not sure
2)
Mass of the CaCl2 = Mass of weigh bottle + CaCl 2 ·2H2O - Mass of weigh bottle after transferring CaCl 2 ·2H2O
= 14.512 - 10.651
= 3.861 gr
Size of volumetric flask: 250 mL
that means 3.861 gram dissolved in 250 mL, Mwt of CaCl2 = 110.98 from wiki
M = 3.861/110.98 x 1000/250
M = 0.1392 mol/L
2)
We have to use Density = mass/volume
mass of the solution = Mass of bottle + aliquot of solution - Mass of empty, dry bottle
= 38.535 - 12.547 = 25.988 gram
voume = 25 mL
density = 25.988/25
= 1.03952 g/cm3
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