The method described above is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative error resulting from a 0.4-mg loss is not to exceed a. -0.1% b. -0.8%
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Given,
Mass of gold lost=0.4 mg
Relative error % a)-0.1%, b)-0.8%
Relative error percentage is defined as-
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- 2. The analytical ability of two lab technicians was compared by having each perform analyses for arsenic using the same method on samples having the same origin. For analyst A, s.d. = 0.12%, N=6; and for analyst B, s.d. = 0.06%, N-5. Do these results suggest a difference in the precision of the two chemists?1. Samples that should not be stored should be prepared/analyzed as soon as possible, especially for measurement…a. hardnessb. Nitritec. Conductivityd. Phenol 2. The following are general sample treatments in pesticide analysis, except…a. Extractionb. Cleaningc. Concentrationd. FilteringPlease help me.. *A 5.0 g coal sample is given for analysis. After subjecting it to hot air oven at 107 oC for 1 hour, it lost 15% of its weight. Calculate the amount of moisture in the sample *a. 0.15 gb. 0.75 gc. 0.30 gd. None of the above
- 2. Quantitative analysis student Analytical analyzed an ore sample for its lead content and obtained a mean of 4.75% Pb for five measurements. If the certified true value is 4.50%, what is the (a) percent error? (b) percent accuracy?.l Q... PIAT ] Question 20: Which of the following is NOT the advantage of grease? Question 21: The common friction modifiers used in grease is A Trcrosy phosohte (TCP) 8. Diben to (Z00P) Question 22: Synthetic oils are used in aerospace applications because & They can withetand very high range o emperature o 1207 10 5000 F. fiheor Nuinctian 22: ldantifir tha INNCNADDENT ctatamani o} o m > > @ uA student determined fluoride in a toothpaste sample using ion chromatography. A toothpaste sample of mass 0.100 g was dissolved in type I water and then quantitatively filtered through a Whatman #1 filter paper into a clean 100 ml volumetric flask. The flask was then made up to volume with type I water and mixed thoroughly.A portion of the solution was filtered through a 0.45 um filter into a sample vial for analysis. Analysis of the sample gave a fluoride concentration of 1.60 mg/l Calculate the % w/w fluoride in the original toothpaste sample. (Give your answer to 3 decimal places please)
- 0.3414 grams of sample (crushed aspirin tablet) was weighed and dissolved in 25 mL ethanol. This solution was transferred into a 100 mL volumetric flask and filled to the mark with deionized water. 20 mL of the solution was filtered through a 0.22 μm pore filter and 503 μL of the filtered sample solution was diluted so, that the final volume of the solution was 12 mL. This sample solution and calibration solutions with known concentration of acetyl salicylic acid (ASA) were injected (injection volume 20 μL) into a HPLC and the following peak areas were measured (expressed as averages from three separate chromatographic runs): Solution Cal 1 Cal 2 Cal 3 Cal 4 Cal 5 Sample Structure of ASA: C(ASA) (mg/L) 0 OH B 53.5 105.9 140.9 195.4 247.4 Average weight of the tablet was estimated as 591.9 mg. What is the mass of ASA in one tablet? Please give the answer with 4 significant digits. Be sure you present the result with units! Peak area (mA.s) 4995 9953 12941 17271 22179 10467.3PART3-1ABORATORY FQUIEMENT FQUIPMENTNAME FUNCTION To hold test tubes. Attaches to a retort stand to support glassware being heated. To pour liquid from a large container into a small container. To provide a flame during an experiment. To light the Bunsen burner. To attach test tubes to a retort stand. To clean substances out of a test tube. To hold a hot crucible or flask. To hold a hot test tube. To place on the lab bench to prevent burning or to use with ring clamp. To transfer small amounts of liquid. To grow bacteria or contain small experiments. To hold liquids. To measure liquids. To contain experiments (a stopper can be used to close the flask). To hold a hot beaker. To perform an experiment with a different substance in each well. To hold chemicals and perform experiments in. To scoop and transfer small amounts of substances. To stir during experiments that involve mixing or dissolving.A bbhosted.cuny.edu/webapps/assessment/take/take.jsp?course_assessment_id=_1... R Paused E Apps G Gmail O YouTube O Maps Home Take Test: Test #1 * Question Completion Status: A MOving to the next question prevents cnanges to tnis answer. Question 4 of 20 > Question 4 4 points Save Answer What is the density of a solid sample that increased the volume of 25.2 mL of water to 34.9 mL when placed in the graduated cylinder and weighs 13.34 g? O A. 0.52 g/mL O B. 0.38 g/mL OC. 1.37 g/mL O D.0.73 g/mL A Moving to the next question prevents changes to this answer. Question 4 of 20 13,846 MAR étv S esc F2 F3 F4 F5 F6 F7 @ %23 24 2 & Q W E R Y II
- - OWLV2 | Assig X MindTap Cen X * MindTap - Cen X amu of ca - Go X b My Questions b/ui/evo/index.html?elSBN=9781337790840&id%3D299783426&snapshotld%3D785765& IGAGE MINDTAP 8: Chemical Composition A. e. 1.96 mg of ethane, C2 H6 Answer 41. Calculate the number of moles of carbon atoms present in each of the following samples. a. 1.271 g of ethanol, C2 H; OH b. 3.982 g of 1,4-dichlorobenzene, C6 H4 Cl2 c. 0.4438 g of carbon suboxide, C3 02 d. 2.910 g of methylene chloride, CH2 Cl2 42 Calculate the numher of moles of sulfur afoms present in each of the following samplesd Tap - Cengage Learning vo/index.html?deploymentld%3D55750828934189288909969212&EISBN=9781305657571&snapshotld%3D2199898&id=. * INDTAP Q Search this co Use the References to access important values if needed for this question. The colorless gas nitryl chloride (CINO,) reacts with water to give a mixture of nitric acid and hydrochloric acid . (a) Write a balanced chemical equation for this reaction. (b) Determine the concentration (in moles per liter) of each of the acids that result from the complete reaction of 3.64×10-² moles of nitryl chloride with enough water to give a solution volume of 746 mL. nitric acid M hydrochloric acid : M Submit Answer 5 question attempts remaining1. List the precautions to be taken to keep a balance functioning correctly. 2 What is the most accurate reading when weighing a solid ? 3. Why cant large crystal be used for melting point determination ? 4. When using melting point to assess purity, how would you know that your sample is impure ?
