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Which of the following statements is true?
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After drying a sample in the oven, you can place it immediately inside the analytical balance.
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In weighing hygroscopic substances, containers should always be kept close when not in use.
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Place solid reagents / precipitates directly on top of the balance pan.
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Liquids can be weighed using a weighing paper.
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- The following volumes of 0.000300 M SCN- are diluted to 15.00 mL. Determine the concentration of SCN- in each sample after dilution. These values will be used during the experiment. Sample 0.000300 M SCN- (mL) [SCN-] (M) 1 1.50 2 3.50 3 7.00 4 10.00. Prepare 50 mL of an aqueous solution of 2.5% (w/v) NaCl (sodium chloride, salt).Determine how many grams of sodium chloride are required. Show all steps for this calculation, using dimensional analysis with units clearly identified.2. Prepare this aqueous solution, using a volumetric flask for the precise final volume measurement. It is not a problem to use tap water.3. Clearly write the procedure (step by step) for making this solutionAmmonium sulfate is added to an unknown mixture of ions. A precipitate forms. The solution is centrifuged, and the remaining solutions is decanted. Ammonium oxalate is then added to the solution and no precipitate forms. Sodium monohydrogen phosphate and sodium hydroxide are added to the decanted solution, and no precipitate forms. Sodium hydroxide is added to a fresh sample of the unknown. A damp piece of litmus paper over the opening of the test tube remains red. Select the ions present. Question 5 options: Ba2+ Ca2+ Mg2+ NH41+
- Ammonium sulfate is added to an unknown mixture of ions. A precipitate forms. The solution is centrifuged, and the remaining solutions is decanted. Ammonium oxalate is then added to the solution and no precipitate forms. Sodium monohydrogen phosphate and sodium hydroxide are added to the decanted solution, and no precipitate forms. Sodium hydroxide is added to a fresh sample of the unknown. A damp piece of litmus paper over the opening of the test tube turns blue. Select the ions present. Question 4 options: Ba2+ Ca2+ Mg2+ NH41+2. Use the formula listed below to calculate how much of each ingredient should be used to make 20,000 ml of Chigger Dope that is used to treat chigger insect bites. Add your solution below the table. Original Conversion New Orange Syrup Formula Factor Formula Benzocaine 400g Methyl Salicylate 160mL Salicylic acid 40g Isopropyl Alcohol NF, 99% 5840mL Pure water qs ad 8000mL Solution:You want to determine the concentration of NaCl in a water. In preliminary analysis, it appears to be saline water with a NaCl content of approximately 4%. Should you dilute the sample if your titrant has a concentration of 0.1 M and you want to spend 25 mL of sample? Solution: You must dilute approximately ten times, taking 10 mL of sample and making up to 100 mL. In this way, 17.20 mL of titrant will be spent.
- A sample of freshly precipitated and filtered silver chloride weighs 459.0 mg. If 1.00 % of the silver chloride becomes photo decomposed, what is the precipitate’s weigh?[Review Topics] [References] Use the References to access important values if needed for this question. An aqueous solution of ammonium acetate, NH, CH3COO, is made by dissolving 8.30 grams of ammonium acetate in sufficient water in a 100. mL volumetric flask, and then adding enough water to fill the flask to the mark. What is the weight/volume percentage of ammonium acetate in the solution? Weight/volume percentage = % Submit Answer Retry Entire Group 4 more group attempts remaining Previous Email Instructor Next Save and Exit30 20 10 From the procedure 2. Assemble the simple distillation apparatus as generally shown in Figure SD.1 in the lab manual, ensuring that the thermometer bulb is aligned at, or slightly below, the Y in the distillation head. Each ground joint is greased by putting three or four stripes of grease lengthwise around the male joint and pressing the joint firmly into the other without twisting. 3. Attach a water condenser to the distillation head. 4. Remember, water goes in the bottom and out the top. Attach a clamp holder to the end of the drain tube to keep it weighted in the drain. Turn water to a trickle. If it is slowly draining, it is high enough. Begin a low flow of water through the condenser. 5. Place the set up on a heating/stir plate. 6. Turn on the hot plate to start heating the solution. Monitor the temperature and the boiling of the solution throughout the distillation process. 7. Record the temperature of the distillate when the first drops are recovered. 30.0 8. Adjust…
- Part IV. Preparation of 100 mL 25% Solution X Materials: Solution X, measuring cylinder, distilled water, and parafilm. Show calculation steps. (1) Calculate the volume of Solution X required. (2) Calculate the volume of distilled water required_ (3) Deliver the calculated amount of distilled water in the measuring cylinder. (4) Add the calculated amount of Solution X to the measuring cylinder. (5) Seal the opening of the measuring cylinder with parafilm. Mix well. (6) Transfer the prepared 25% Solution X into a labelled container.A sample containing chlorophenol, C6H4ClOH, was analysed by gravimetric analysis. A 0.783-g of this sample goes through a chemical process allowing the chlorine in the chlorophenol to precipitate as silver chloride, weighing 0.271 g. Calculate the % (wt/wt) of the chlorophenol in the sample, assuming that chlorophenol is the only source of chlorine in the sample. Provide your answer to two decimal places and without units. Avoid using scientific notation.A technician was analysing some waste water from an industrial plant. He collected 500 mL of the water and separated it into two 250 mL samples. He filtered one sample and evaporated the water from the other one. He weighed the dried solid residue from each sample. He found that the mass of solid from the filtered sample was 40 g and the mass from the evaporated sample was 55 g. What mass of soluble and insoluble material was in 1 L of the waste water?
