18 Questions
What is the purpose of adding Mg2+ and aqueous NH3 in the procedure to determine the percentage of P in a sample of commercial phosphate detergent?
To precipitate the phosphate as MgNH4PO4.6H2O
What is the mass of CaO per gram of CaC2O4 precipitate?
56.077 g/mol / 100 g/mol
In the determination of Ca in a natural water sample, what is the purpose of igniting the CaC2O4 precipitate in a crucible?
To convert the CaC2O4 to CaO
What is the gravimetric factor (GF) for the precipitation of AgCl?
Cl/AgCl
What is the percentage of P in a sample of commercial phosphate detergent, given that 0.2161 g of Mg2P2O7 is obtained from 0.3516 g of the sample?
17.11 %P
What is the concentration of Ca in a natural water sample, given that 26.7134 g of CaO is obtained from 200.0 mL of the sample?
4.045 x 10^-4 g/mL
What is the primary analytical parameter in the classical method of determining carbon and hydrogen in organic compounds?
The change in mass of the combustion products
What is the purpose of adding an excess of paraperiodic acid in the precipitation reaction of mercury?
To ensure complete precipitation of mercury
What is the product of the reaction between ammoniacal nitrogen and chloroplatinic acid?
Slightly soluble ammonium chloroplatinate
What is the percentage of Hg2Cl2 in the sample if 0.5718 g of precipitate is recovered from a 1.0451-g sample?
54.81 %
What is the purpose of igniting the precipitate of ammonium chloroplatinate in the determination of ammoniacal nitrogen?
To produce metallic platinum and gaseous products
What is the percentage of ammonia in a sample if 0.2115 g of sample produces 0.4693 g of platinum?
45.79 %
If 1.1682 g of precipitate were obtained from a 0.2711-g sample, what is the percent P in the sample?
7.113%
If a 1.52-g sample yields Mn3O4 weighing 0.126 g, what would be the percent Mn2O3 in the sample?
8.58%
A 1.1324-g sample of a magnetite ore was dissolved in concentrated HCl to give a solution. What is the percent Fe in the sample?
33.32%
What weight of pyrite ore must be taken for analysis so that the weight of BaSO4 precipitate obtained will be equal to one-half of the percent S in the sample?
6.870 g
What is the formula of the compound obtained after the addition of NH3 to the solution of magnetite ore?
Fe2O3.xH2O
What is the formula of the compound used to determine the percent P in the sample?
(NH4)3PO4.12MoO3
Solve exercises on gravimetric analysis, calculating the mass of analyte per gram of precipitate. Practice conversions and calculations for various substances like Ag3PO4, BaSO4, Fe2O3, and more.
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