Category: Chemical Engineering Math
"Published in Newark, California, USA"
What is the molarity of a KMnO4 solution standardized against 1.356 gram Na2C2O4 (134 g/mole) requiring 25.1 mL of the solution in acidic medium.
Solution:
The given word problem is about oxidation reduction reaction or redox in short. There's a change of their oxidation numbers in the redox reaction and sulfuric acid is used as a catalyst as follows
Therefore, from the chemical reaction above, the molarity of KMnO4 solution is
Category: Chemical Engineering Math
"Published in Newark, California, USA"
What volume of 0.0305 M EDTA is needed to titrate the Ca in 178.56 mg of CaCO3?
Solution:
If CaCO3 sample is titrated with EDTA disodium salt solution, then the chemical reaction is
Therefore, from the chemical reaction above, the volume of EDTA disodium salt solution to titrate CaCO3 sample is
Category: Chemical Engineering Math
"Published in Newark, California, USA"
An EDTA solution prepared from its disodium salt was standardized using 506.3 mg of primary standard CaCO3 and consumed 28.50 mL of the solution. The standard solution was used to determine the hardness of a 2L sample of mineral water, which required 35.57 mL EDTA solution. Express the analysis in terms of ppm CaCO3.
Solution:
If CaCO3 is used to standardized EDTA disodium salt solution, then the chemical reaction is
From the chemical reaction above, we can calculate the concentration of EDTA disodium salt solution as follows
If the standardized EDTA disodium salt solution is used to determine the hardness of mineral water, then the amount of CaCO3 is
Therefore, the amount of CaCO3 in ppm is
