Question 1: Fill in the place holders with the suitable number: Number 1 2 3 4 5 Conductance. split into ions. Voltmeter. Resistivity. Higher concentration. Number Ω m Molar conductivity at infinite dilution. potential difference. Electrolyte. electric current.
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- The stock erythrosine B solution is 8.5 × 10-5 M. Calculate the volume of this solution that you must pipet into a 50-mL volumetric flask, which, when diluted to mark with deionized water, will give a final concentration of 1.7 × 10-5 M. Show your calculation setup.write true if the statement if correct and change the bold word/phrase to make it correct in nelson's assay, addiion of arsenomolybdic acid to Cu2O will "reduce" copper to Cu2+ ionHDPE and PS are both inert to bases and acids, which plastic would you rather chose to put 1 Liter of 6M HCl for general chemistry lab? Explain why.
- True or False: The accuracy of a buret is to 0.05 mL. True or False: Burets are stored with distilled water to help prevent against corrosion of the inside of the glass tube.Why High quality deionized water is very resistive and merely conduct electricity (0.5 mS/cm) at 25 oC.? Why Conductivity of a typical drinking water is in the range of (200 to 800) mS/cm at 25 oC?Answer no. 3 only. Only state where the product (waste) should the waste should be disposed
- Using a 25mL pipette, you prepare a standard solution by pipetting 25.00mL of the standard iron solution[0.25g/L] into a 500mL volumetric flask. Then, using a 10mL pipette you transfer a 4mL aliquot of this solution into a 50mL volumetric flask and dilute up to the mark. Calculate the % uncertainty. Question 1 options: 0.65 0.75 0.0075 0.45THE QUESTION IS AT THE PICTURE... 1 QUESTIONS ONLY.. AND THE GIVEN PROBLEMS IS THE ONE I TYPEDA. 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 forthe turbidity to appear.5. Increase the…Five white, 500-mg uncoated ascorbic acid (AA) tablets with an average weight of 0.6152-g were pulverized in a mortar. A sample of the powdered ascorbic acid weighing 0.4700-g was placed in an iodine flask and was dissolved in 50-mL H2SO4 then 5-g of KBr was added to the resulting solution. The solution was titrated with 47.81-mL of 0.09640 N STD. KBrO3 to reach a faint yellow endpoint then 3-g KI and 5-mL Starch TS. The blue color solution is then titrated with 2.73-mL of 0.09123 N STD. Na2S2O3 to reach the disappearance of the blue iodostarch complex. MW: KBrO3 = 167.0 ; KIO3 = 214.0 ; Na2S2O3 = 158.11 ; C6H8O6 = 176.12 Compute the milligrams of pure AA per tablet from the assay. 293.3 mg 502.5 mg None of the choices 383.9 mg
- Questions 4 and 5 pertain to the following scenario: The patient needs 500 g of the above ointment to use as part of phototherapy.4. Calculate the weight of betamethasone 0.05 % (w/w) ointment required, in grams.5. The above ratio is weight-based. Calculate the volume of mineral oil (sp gr = 0.85), in milliliters.Calculate the percent purity of copper in an ore in terms of Cu2O from the given data: Weight of copper ore - 1.20-g Volume of Na2S2O3 used - 40.00-mL (1.00-mL Na2S2O3 ≈ 0.004175-g KBrO3) Molar Masses: KBrO3 = 167.0 Cu2O = 143.1 answer: 35.8% Cu2o need solutionA colored solution of concentration 0.0248 mol/L has an absorbance of 0.353. What is the concentration a solution of the same solute with an absorbance of 0.627? Assume that the same sample cell is used for both readings. Report your answer to 3 significant figures.