A Bottle roll test was conducted on 2 kg of a soil sample at 50% solids. 50 g of the tailings was digested with aqua-regia and topped to 10 ml. The data obtained after AAS is presented in Table 1. Find the head grade and percent recovery for each period and plot a suitable graph. Are there preg-robbers in the sample? Time, h Gold in solution, mg/l 1.75 4 1.52 8. 3.10 16 4.52 24 4.35 www.knust.edu.gh Activate Tailings 0.92 etti 26
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- . 100 ml boiled cooled and filtered water sample takes 9.6 ml of M/50 EDTA in titration. The Permanent hardness of the water sample in terms of ppm of CaCO3 equivalent isSheet 5 From the following data determine the following: Define outlier and then identify the outlier in the data. Determine if the outlier should be kept of discarded from the data. Trial 1 2 3 4 HCl (mL) 22.3 28.4 29.8 29.3 NaOH (mL) 35.2 35.1 34.9 35.0Table 1: Standardization Data Trial 1 Trial 2 O145504 Mass of KHP 04536 Initial burette reading 0.05ML 12.3 ML Final burette reading 12.8 a6.omL Volume of base used ר.12 13.2 mL Data Analysis: KH Cg Hg Da (MOIAR MASS 2041ag) 1. Calculate the molarity of base for each trial. You must use dimensional analysis – show all unit conversions (hint: start with grams of KHP used). Review the balanced equation for KHP and NaOH you wrote in Expt 11 part 1. (204.29 TRIAI 1: 0.4550g. Average: Trial 2: Trial 1: with 1875 mL of your base (use the average
- percentage purity of an ibuprofen sample was determined by a reversed phase HPLC method as follows: Y Der ● A calibration curve of peak area versus concentration (ug/mL) of pure ibuprofen was constructed The ibuprofen sample for analysis was prepared by taking 10.0204 g of powder and dissolving it in/1Lbf distilled water (solution A). 1 ml of the latter solution was further diluted to IL with distilled water (solution B). Solution B was analysed by HPLC analysis Results The equation for the best-fit line of the calibration curve is: y=26820x-1323.8. ● The average peak area for the ibuprofen sample (solution B) was 266796.2 Calculate the percentage purity of the ibuprofen powder.An analyst weighed 0.25045 g of the Buffalo River Sediment reference material.(RM # 8704) to determine Pb levels. The material was digested in an acid medium toBring it to a solution which was made up to the 30.2450 mL mark with distilled water. If thePb concentration in the control certificate of analysis is (150 ± 17) mg / kg, and theanalyst recovered 95%, what was the concentration of Pb in the solution?P TrueVision HD blackboard.uob.edu.bh/ultra/courses/ 19902 1/outline/assessment/ 452605 1/overview/e 1768814 1?cou Voitmeter e e salt bridge Fe KCI Cu FeSO4 CUSO,
- Felodipine calcium channel blocker standard (0.251mg/ml) and felodipine sample (0.245mg/ml) solutions were prepared and injected to the HPLC. The peak area of felodipine standard is 275428 and the sample is 272982. The potency (purity) of felodipine standard is 98.9%. What is the assay percentage of felodipine? a. 102.23 b. 98.71 c. 101.07 d. 100.42ASSAY Calibration solutions Calibration solutions of naproxen in the range 5 – 25 μg/mL were prepared. Sample preparation 20 tablets weighing 12.3819 g were crushed to a fine powder. A portion of the powder (145.4 mg) was shaken with approximately 150 mL of acetic acid (0.05 M) for 5 min and then made up to volume in a 250 mL volumetric flask (stock solution). Approximately 50 mL of the stock solution was filtered and a 25 mL aliquot was diluted to 100 mL in a volumetric flask. 10 mL of the resulting solution was further diluted to 100 mL with acetic acid (0.05 M). Analysis The standards and sample solutions were analyzed by HPLC under the following conditions: Column: octadecylsilyl (ODS), 4.6 mmx150 mm, mobile phase: acetonitrile : 0.05 M acetic acid (85:15), flow rate: 1 ml/min, UV detection at 243 nm. Results: A calibration curve of concentration versus peak area was constructed for the standard solutions and gave the straight-line equation: y = 3555.6x + 85, r = 0.9999 The area…How many replicate measurements are needed to decrease the 95 and 99% confidence limits for the analysis de- scribed in Problem 7-7 to + 2.2 ug Fe/ml?
- 3. An instrumental method was validated by running an analysis on a standard solution with a known concentration of 1.00 mM. Results from a series of trials are given below. Do the two methods agree or not? How confident are you? Replicate C/ mM 1 1.074 2 1.035 3 1.048 4 1.028 1.059 6 1.037A chromatographic analysis is performed with a sample containing toluene and benzene. The column length was 25 m and the flow rate 45 mL/min. Solute tR air 1.75 benzene (A) 7.00 1.85 toluene (B) 16.10 1.65 Calculate the theoretical plate height for each peak. Benzene: 109 mm/plate and Toluene 16 mm/plate Benzene: 105 mm/plate and Toluene 49.7 mm/plate Benzene: 172 mm/plate and Toluene 175 mm/plate Benzene: 119 mm/plate and Toluene 181 mm/plateChemistry help solve part d to h. the standard deviation is 0.0043m and the mean is 0.1052m.