pls compute how to prepare the solutions 1. 100.0 mL 0.0500 M stock Ca2+ solution
pls compute how to prepare the solutions
1. 100.0 mL 0.0500 M stock Ca2+ solution
a. Weigh appropriate amount of pure CaCO3 (FW=100.09) to the nearest 0.1 mg into a 250 mL beaker.
Add about 40.0 mL distilled water. Take note of the purity of CaCO3 used.
b. Carefully and slowly add concentrated HCl to dissolve the CaCO3 solids while stirring and heating
the solution in a hotplate. Do this until the CaCO3 solids are completely dissolved or until no more
effervescence is observed.
2. 100.0 mL 0.0500 M stock Ca2+ solution
a. Weigh appropriate amount of pure CaCO3 (FW=100.09) to the nearest 0.1 mg into a 250 mL beaker.
Add about 40.0 mL distilled water. Take note of the purity of CaCO3 used.
b. Carefully and slowly add concentrated HCl to dissolve the CaCO3 solids while stirring and heating
the solution in a hotplate. Do this until the CaCO3 solids are completely dissolved or until no more
effervescence is observed.
NOTE: The stirring must be vigorous enough to dissolve the solids. It is advisable to swirl the beaker
using a crucible tong instead of using a stirring rod.
c. Quantitatively transfer the solution into a 100-mL volumetric flask. Dilute to mark with distilled
water, cover and mix.
d. Transfer to a clean, plastic (polyethylene) bottle. Label as 0.0500 M stock Ca2+ solution.
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