A tank contains 200L of a dye solution with a concentration of 1gram per liter. To prepare for the next experiment, the tank is to be rinsed with fresh water flowing in a rate 2 liters per minute; the well stirred solution flowing out with the same rate. Find the time that will elapse before the concentration of dye in the tank reaches 1% of its original value.
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- Because of the risk of lead poisoning, the exposure of children to lead-based paint is a significant public health concern. Thefirst step in the quantitative analysis of lead in dried paint chips is to dissolve the sample. Corl evaluated several dissolution techniques.24 In this study, samples of paint were collected and pulverized with a Pyrex mortar and pestle. Replicate portions of the powdered paint were then taken foranalysis. Results for an unknown paint sample and for a standard reference material, in which dissolution wasaccomplished by a 4–6-h digestion with HNO3 on a hot plate, are shown in the following table. (a) Determine the overall variance, the variance due to the method, and the variance due to sampling. (b) What percentage of the overall variance is due to sampling? (c) How might the variance due to sampling be decreased?When we make a calibration curve, we want the range of calibration standards to the analyte concentrations in the samples. If this is not the case, we will have to the samples, depending on the analyte concentration. O Exclude, concentrate or dilute O Include, spike O Include, concentrate or dilute None of These O Exclude, calculate the concentration of You have prepared a set of calibration standards for nitrate in surface water where you are using Beer's Law to generate the calibration curve. The calibration equation for the standards you have prepared between 1 and 15 ppm is y = 0.0820x +0.00900. You analyze a 3.00 mL water sample and generate an absorbance response of 1.12. You report the concentration of nitrate in this sample as: O None of These O 4.52 ppm O The concentration is out of range so it cannot be reported O 13.5 ppm O 13.5 absorbanceTHE QUESTION IS AT THE PICTURE... 2 QUESTIONS ONLY.. AND THE GIVEN PROBLEMS IS THE ONE I TYPED............. PLEASE TYPE YOUR ANSWER PLEASE....A. Concentration1. Place 3 mL each of 6N, 3N, & 1.5N hydrochloric acid in separate test tubes.2. Drop simultaneously equal lengths (about 1cm) of magnesium ribbon and note thetime it takes for the magnesium to dissolve in each use.B. Surface Area1. Weigh a small iron nail to the nearest hundredths of a gram and weigh an equalamount of iron fillings.2. Place them in a separate test tubes.3. Add simultaneously 3 mL of 3N hydrochloric acid and compare the rates of reaction.C. Temperature1. Place 5 mL each of 0.1N sodium thiosulfate solution into 5 test tubes.2. Place all five test tubes in the water bath and let it stand for 1 minute.3. Record the temperature of the water bath. Remove the first test tube from thewater bath and place it in the test tube rack.4. Add 1 mL of 0.1M sulfuric acid and stir with a glass rod. Record the time it takes…
- 00 mL of a diprotic acid primary standard solution was accurately prepared to a concentration of 0.1431 M. Three samples of this primary standard solution were used as samples in a titration to standardize an aqueous solution of sodium hydroxide, NaOH, which would be used as a titrant. Using the following table of data for the titration of the primary standard acid with NaOH, calculate the average concentration of NaOH. Trial # Volume of primary standard Initial titrant volume Final titrant volume 1 10.00 mL 8.21 mL 27.22 mL 2 10.00 mL 27.22 mL 46.23 mL 3 10.00 mL 30.28 mL 49.29 mL 0.1506 M 0.0753 M 0.0376 M 0.1431 M 0.0526 MSheet 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 35.04. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value.
- Q1: What is the density (g/ml) of a 3.6M Sulfuric acid solution that is 29% H,So, by mass (Mwt. = 98)? Q2: Fill the blanks with suitable answers 1: The is the thing being dissolved. ......... 2: The branches of quantitative analysis are and 3. The filterability of the precipitate depend on the of practices. Q3: Which one is correct? 1. Molality changes with temperatures. 2. Molality does not change with temperatures. 3. Molarity changes with temperatures. 4. Normality changes with temperatures. Q4: What weight of pyrite ore (impure FeS,) must be taken for analysis so that the BaSO, precipitate weight obtained will be equal to one-half that of the percent S in the sample? Note: Mwt. of Ba =32, Mwt. of BaSo4 =233, Mwt. of FeS, =119For each of the following scenarios, determine if the error will cause the molarity of the hydrochloric acid to be greater than, less than, or the same as the initial value. A: A student adds 50 mL of water to the reaction flask with unknown hydrochloric acid instead of the 25 mL sated in the procedure. B: A student adds 50 mL of water to the reaction flask with unknown hydrochloric acid instead of the 25 mL stated in the procedure. C: A student doesn't notice the some of the HCL has dripped out from the volumetric pipet when transferring to the reaction flaskTable 1: Volumes in of iodine in mL used to titrate mixtures of 10 mL of reaction mix and 10 mL of urine. student trial 1 trial 2 trial 3 total volume (mL) a 12.6 11.8 12.5 300 290 b. 10.6 10.7 10.6 11.1 118 12. 10.9 405 13.0 12.5 349 mg vit. C mL iodine TV (mL/hour) 10 mL urine aliquot TVC (mg/hour) =7 (mL) · CF !! What is the hourly vitamin C excretion rate (mg/h) of student b if the CF is 1.06? (include no more than two decimals in your answer, e.g.: 123.45, and do not type the units) 10.6 need ASAP
- Which of the following describes a gradient elution process? stationary phase has varying concentration stationary phase has static concentration mobile phase has varying concentration mobile phase has static concentrationWhich of the following describes a gradient elution process? stationary phase has varying concentration mobile phase has varying concentration stationary phase has static concentration mobile phase has static concentrationSTANDARD SAMPLE PREPARATIONS FOR ABSORBANCE & CONCENTRATION DATA Concentration of stock nickel sulfate hexahydrate solution = .400 Molarity Sample Volume Absorbance Concentration (In Molarity) a 5 mL .179 10 mL .329 15 mL .588 20 mL .760 25 mL .939 Reference Blank = 0 Please show how to find Molarity, please show steps. Thank you and stay safe.