1. You need to make an aqueous solution of 0.138 M magnesium bromide for an experiment in lab, using a 125 mL volumetric flask. How much solid magnesium bromide should you add?
2. How many milliliters of an aqueous solution of 0.163 M aluminum nitrate is needed to obtain 13.4 grams of the salt?
3. n the laboratory you dissolve 19.8 g of
calcium chloride in a volumetric flask and add
water to a total volume of 250 . mL.
What is the molarity of the solution?
1)
volume , V = 1.25*10^2 mL
= 0.125 L
use:
number of mol,
n = Molarity * Volume
= 0.138*0.125
= 1.725*10^-2 mol
Molar mass of MgBr2,
MM = 1*MM(Mg) + 2*MM(Br)
= 1*24.31 + 2*79.9
= 184.11 g/mol
use:
mass of MgBr2,
m = number of mol * molar mass
= 1.725*10^-2 mol * 1.841*10^2 g/mol
= 3.176 g
Answer: 3.18 g
Only 1 question at a time please
1. You need to make an aqueous solution of 0.138 M magnesium bromide for an experiment...
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