Created on February 09, 2025 By Sana KaussarGravimetric Analysis quiz -Batch 7Gravimetric analysis is a quantitative chemical technique used to determine the mass of an analyte by converting it into a stable, measurable form. It involves precipitation, filtration, drying or ignition, and weighing of the final product. The method is highly accurate and used for determining the composition of compounds in various industries, including pharmaceuticals and environmental science. 1 / 30The process of allowing a precipitate to stand in solution before filtration is called 1) Drying 2) digestion 3) adsorption 4) elution 2 / 30Which factor is important for forming a filterable precipitate? 1) The precipitate should be fine and colloidal 2) The precipitate should form large particles 3) The precipitate should dissolve in water 4) The precipitate should be completely soluble in acid 3 / 30Which of the following conditions favors the formation of large precipitate particles? 1) Rapid addition of reagent 2) Slow addition of reagent with stirring 3) Using a high concentration of reagent 4) Increasing temperature suddenly 4 / 30Which of the following is not a requirement for a precipitate in gravimetric analysis 1) Large particle size 2) High solubility 3) Known composition 4) purity 5 / 30Which of the following is an application of gravimetric analysis? 1) Determination of sulfate as BaSO₄ 2) Identification of organic compounds 3) Spectrophotometric analysis 4) Gas chromatography 6 / 30Which of the following is tested in the filtrate to ensure complete precipitation 1) pH of the solution 2) Presence of residual analyte 3) Volume of the solution 4) Color of the filtrate 7 / 30Why is a selective reagent used in precipitation 1) To ensure rapid reaction 2) To avoid co-precipitation of unwanted species 3) To increase the solubility of the analyte 4) To enhance the color change 8 / 30Which of the following properties is important for a precipitate in gravimetric analysis 1) High solubility 2) Volatility 3) Stability under heating 4) Bright color 9 / 30In precipitation, the formation of fine particles instead of large filterable ones is called 1) nucleation 2) Co-precipitation 3) Precipitate aging 4) adsorption 10 / 30What is the primary basis of gravimetric analysis 1) Color change of the analyte 2) Electrical conductivity of the solution 3) Measurement of the mass of the analyte 4) Change in temperature 11 / 30The purpose of washing the precipitate is to 1) Dissolve the precipitate 2) Remove excess reactants and impurities 3) Convert the precipitate to a gaseous state 4) Increase the weight of the precipitate 12 / 30What type of filter paper is commonly used for gravimetric analysis? 1) Ordinary filter paper 2) Ashless filter paper 3) Chromatography paper 4) coated filter paper 13 / 30Gravimetric analysis is considered a fundamental method in classical analytical chemistry because of its 1) High accuracy and precision 2) Rapid results 3) Use of expensive equipment 4) Ability to detect trace elements 14 / 30Which factor affects the filtration efficiency in gravimetric analysis 1) Shape of the precipitate 2) Color of the solution 3) pH of the filtrate 4) Volume of the sample 15 / 30Which condition promotes large particle growth in precipitation 1) High supersaturation 2) Low supersaturation 3) Rapid addition of precipitant 4) High stirring speed 16 / 30The gravimetric factor (GF) is defined as: 1) The ratio of the mass of analyte to the mass of the precipitate 2) The molar ratio of analyte to precipitate 3) The total weight of precipitate 4) The conversion factor for grams to moles 17 / 30Which of the following is a common drying temperature range for gravimetric precipitates 1) 250-500°C 2) 50-100°C 3) 800-1000°C 4) 1500-2000°C 18 / 30Digestion is the process of 1) Heating the precipitate in contact with the solution to improve particle size 2) Filtering the precipitate under vacuum 3) Dissolving the precipitate for further analysis 4) Removing moisture from the precipitate 19 / 30What is the purpose of drying or ignition in gravimetric analysis 1) To dissolve the precipitate 2) To remove moisture and volatile impurities 3) To increase the solubility of the analyte 4) To facilitate filtration 20 / 30Peptization occurs when 1) A precipitate dissolves back into solution due to excess washing with pure water 2) The precipitate forms large crystals 3) The precipitate turns into a gas 4) Digestion is carried out for too long 21 / 30Which type of furnace is used for ignition in gravimetric analysis 1) Muffle furnace 2) Electric furnace 3) Microwave furnace 4) Glass furnace 22 / 30Which of the following is the correct order of gravimetric analysis steps 1) Precipitation → Digestion → Filtration → Washing → Drying → Weighing 2) Filtration → Precipitation → Drying → Washing → Weighing 3) Drying → Precipitation → Filtration → Washing → Digestion 4) Washing → Drying → Precipitation → Filtration → Weighing 23 / 30Which impurity is most difficult to remove from a precipitate 1) Occlusion 2) inclusion 3) Surface adsorption 4) post-precipitation 24 / 30Which of the following is the first step in gravimetric analysis 1) Drying 2) filtration 3) precipitation 4) Titration 25 / 30Which of the following is NOT a step in gravimetric analysis 1) Precipitation 2) filtration 3) titration 4) drying 26 / 30Gravimetric analysis is mainly used for 1) Qualitative analysis 2) Quantitative analysis 3) Colorimetric analysis 4) spectroscopy 27 / 30Supersaturation occurs when 1) The solubility product (Ksp) is lower than the ionic product 2) The solubility product (Ksp) is equal to the ionic product 3) The solubility product (Ksp) is higher than the ionic product 4) No precipitation occurs 28 / 30Which of the following is commonly used for vacuum filtration 1) Sintered glass funnel 2) Buchner funnel 3) Separatory funnel 4) Conical funnel 29 / 30What is an example of a precipitate prone to surface adsorption 1) AgCl 2) CaCO₃ 3) NaCl 4) ZnO 30 / 30Which of the following compounds is used in gravimetric analysis for determining sulfate content 1) BaSO4 2) AgCl 3) PbSO4 4) Na2SO4 Your score isThe average score is 74% 0% Restart quiz
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