Gravimetric Analysis
Chemistry ⇒ Analytical Chemistry
Gravimetric Analysis starts at 11 and continues till grade 12.
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See sample questions for grade 11
Define co-precipitation in the context of gravimetric analysis.
Describe the purpose of ignition in gravimetric analysis.
Describe the role of a desiccator in gravimetric analysis.
Explain why gravimetric analysis is considered a primary method of analysis.
A sample containing sulfate ions is analyzed gravimetrically by precipitating as BaSO4. If 0.233 g of BaSO4 is obtained, calculate the mass of SO42- in the sample. (Molar mass of BaSO4 = 233 g/mol, SO42- = 96 g/mol)
A sample of hydrated magnesium sulfate (MgSO4·xH2O) is heated until all water is lost. If the initial mass is 2.50 g and the final mass is 1.20 g, calculate the mass of water lost.
A sample of potassium chloride is analyzed gravimetrically by precipitating as AgCl. If 0.287 g of AgCl is obtained, calculate the percentage of KCl in the original 0.500 g sample. (Molar mass: AgCl = 143.5 g/mol, KCl = 74.5 g/mol)
A student is analyzing a sample for calcium by precipitating it as CaC2O4. If 0.250 g of CaC2O4 is obtained, calculate the mass of Ca2+ in the sample. (Molar mass of CaC2O4 = 128 g/mol, Ca = 40 g/mol)
Which of the following is a common error in gravimetric analysis? (1) Overheating the precipitate, (2) Using excess washing, (3) Using distilled water, (4) Using a desiccator
Which of the following is a common gravimetric precipitate for the determination of iron? (1) Fe(OH)3, (2) FeSO4, (3) FeCl3, (4) Fe(NO3)3
Which of the following is a common method for drying a precipitate? (1) Air drying, (2) Oven drying, (3) Desiccator, (4) All of these
Which of the following is a disadvantage of gravimetric analysis? (1) High accuracy, (2) Time-consuming, (3) Simple equipment, (4) No need for calibration
In gravimetric analysis, the mass of the filter paper is subtracted from the total mass to obtain the mass of the __________.
The process of heating a precipitate to a high temperature to convert it into a stable, weighable form is called __________.
The process of removing adsorbed impurities from the surface of a precipitate is called __________.
The process of separating a precipitate from a solution by passing it through filter paper is called __________.
The percentage purity of a sample can be determined by gravimetric analysis. True or False?
True or False: Co-precipitation can introduce errors in gravimetric analysis.
True or False: Gravimetric analysis can be used to determine the amount of water in a hydrate.
True or False: In gravimetric analysis, the analyte is always converted into a gaseous product.
