QUESTION 18 In the experiment "Density of a Solution", why was it necessary to calibrate the volumetric pipet? To identify the liquid in it To remove potential contaminants To increase the accuracy of its volume To determine the mass of the liquid it dispenses
Q: alcohol
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A: Given: Concentration of stock solution, M1 = 2.25M Volume of stock solution needed, V1 = ?…
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Q: A chemist needs 16.63 mL of 1.816 M NaOH. What volume in mL of 3.97 M NaOH must be diluted in water…
A: During dilution with water the number of moles before dilution and after dilution remains constant.
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Q: If a 1000ml liquor beer is 36% alcohol by volume, how many ml of the solution are ethanol?
A: Given data Volume % of alcohol (solute) = 36 % Total volume of solution = 1000 mL…
Q: QUESTION 18. In the experiment "Density of a Solution", why was it necessary to calibrate the…
A: last option to dispense the exact amount of liquid is correct option
Q: A bottle contains 59 mL of lemon extract solution. If the extract contains 49 mL of alcohol, what is…
A: Total Volume = 59ml Volume of alcohol = 49ml
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A: The final solution is having solids present in the solution. Hence to separate the solid from the…
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A: Molarity of the solution containing 58.9g of nickel (II) nitrate in 350L of water is
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Q: Please report your answer in mL to 3 decimal places. No units please.
A: The molarity is used to define concentration which is determine as the number of moles of solute…
Q: A solution is the same as a compound homogeneous mixture heterogenous mixure element
A: The homogeneous mixture of two or more substances is known as a solution. The solution is made from…
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A: This candy is soluble in water and hence it will dissolve in all other polar solvents. If we take…
Q: What is the narrow graduated piece of glass equipment called?
A: Hi! Thank you for the question As per the honor code, We’ll answer the first question since the…
Q: You were tasked to prepare nitric acid with a concentration of 1.28 M. What will be the volume (in…
A: Recall the data, M1=1.28M, V1=? M2=3.0M , V2=139 ml
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Q: alt A solution was prepared by dissolving 1.058 g of NAOH pellets with 100 mL of distilled water and…
A: Here 1.058 gram of NaOH pellets was dissolved in 100 ml distilled water and then transferred to…
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Q: What volume of the stook solution (Part A) would contain the number of moles present in the diluted…
A: Mass of Luminol = 19.0 g Molar Mass of Luminol = 177.16 g/mole Moles of Luminol =Mass of luminol /…
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Q: 8.5 mL of a sample of sea water solution was added to a 44.317 g evaporating dish. The combination…
A: a. The given mass of dish = 44.317 g The weight of solution = 52.987- 44.317 = 8.67 g
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Q: A mixture of spaghetti and water is separated using a strainer, a physical method of separation.…
A: Filtration : It is the process of separating solid matter from the fluid one using a structure…
Q: If a student dissolves 17.5 g of sodium chloride in 500 mL of water what is the mass percent?
A: Given a student dissolves 17.5 g of sodium chloride in 500 mL of water what is the mass percent…
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Q: Calculate the molarity of a solution made from 42.6 g of NaCl into a total volume of 1,396 mL. Be…
A: since you have posted a multiple question in a single session, we are entitiled to answer only first…
Q: If 10 mL of an aqueous sample is diluted with 90 mL of water, and then 1 mL of that diluted sample…
A: Given: 10 mL of an aqueous sample is diluted with 90 mL of water, and then 1 mL of that diluted…
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A: Solution is made up of solute and solvent.Solute is present in small amount and solvent is present…
Q: Directions: Match the following terms in column A to the description that matches them in column B.…
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Q: what is the mass of a hydrated salt?
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A: Calcium Carbonate is CaCO3 and Calcium Chloride is CaCl2. The mixture of Calcium Carbonate and…
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Q: Complete the following table as directed: Do not include units Report answers with the appropriate
A: Molarity is number of moles dissolved in per litre of the solution
Q: A homogeneous mixture composed of a solute and solvent________?
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A: Given: Mass of dilute aqueous solution = 10.07 g.
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- A stock solution of 75% v/v ethanol was diluted with distilled water to prepare 1L of 42% v/v ethanol. (Density of ethanol = 0.789 g/mL; MW of ethanol = 46 g/mol). Determine the initial volume (in mL) of 75% v/v ethanol used in the preparation. Final answer should NOT contain any unit. Type the VALUE only. Please observe 0 decimal places.A study is being performed to see if there is a correlation between the concentration of chromium in the blood and a suspected disease. Blood samples from a group of volunteers with history of the disease are analyzed and compared with the results from the healthy control subjects. From the following results (Table 1), determine whether the differences between the two groups can be ascribed as chance or whether they are real at 95% confident level.Before Investigating the scene the technician must dilute the luminol solution to a concentration a 2.00 × 10-2 M. The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in 2.00L of the diluted spray?
- I am allowed to work with someone I just don’t understand this Using the Volumetric Pipet Data from Part C calculate the 10. Average experimental density of the three samples of salineStandardization of Sodium Thiosulfate Solution Primary Standard used: Potassium Dichromate Formula mass of 1o standard: __________________ % Purity of 1o standard: 99.80% Trials 1 2 3 Weight of K2Cr2O7 (g)Weight of K2Cr2O7 (g) 0.0315 0.0331 0.0380 Final Volume Reading Na2S2O3 (ml) 27.50 27.50 34.90 Initial Volume Reading Na2S2O3 (ml) 1.10 0.00 1.00 Net Volume Na2S2O3 used (ml) Molarity of Na2S2O3Hello, I hope you are doing well on this fine day. For the following quetion please read carefully the question and instruction. PLEASE ANSWER QUESTION IN 15 MINTUES NOT MORE PLEASE AND THANK YOU. If you do answer the question correctly and post it in the next 15 minutes, NO NEED TO SHOW THE WORK, I JUST WOULD LIKE THE CORRECT ANSWER AS SOON AS POSSIBLE. I will write a wonderful and generous feedback/review/rating about you. You determined experimentally the density of a solution in triplicate. Considering the results what is the standard deviation of your results? Answer your question with the correct number of significant figures. The answer should be in units of g/mL Trial 1: 0.9997 g/mL Trial 2: 0.9985 g/mL Trial 3: 0.9987 g/mL
- 4. 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.Jody, a medical assistant in a small clinic, ran out of surface disinfectant while cleaning thecounters in the clinic laboratory. The label of the disinfectant bottle she was using containedinstructions for preparing the surface disinfectant from the concentrated stock solution. Theinstructions read “Dilute the concentrate 1:50 with water.” Jody was using a disinfectant bottlewith a 500 mL capacity. 1. 1. Jody should prepare the replacement surface disinfectant by:a. Adding 1 mL of concentrate to 50 mL of waterb. Adding 10 mL of concentrate to 500 mL of waterc. Adding 10 mL of concentrate to 100 mL of waterd. Adding 10 mL of concentrate to 490 mL of waterScientist 1 analyzed the compounds first then gave it to scientist 2 for the next test. Scientist 2 needs to know the molar mass of the active compound. The concentration of the solution they created is twenty percentw/w from the solid active compound and it has a density of 1.40 grams per millilitre. Ten microliters were taken from this solution and mixed with one hundred ninety microliters of reagent and water. After analyzation, it showed that the compound's concentration is Five times ten raised to negative four M i. Find the concentration of the twenty percentw/w solution. The concentration must be in the form of molarityii. Explain the reason why the concentration of the solution was expressed as %w/w initially?iii. Determine the active compound's molar mass.
- Using the Volumetric Pipet Data from Part C calculate the: 11. Range of the densities of the three samples of salineA student was given an unknown hydrate, which could be one of threepossibilities: magnesium sulfate heptahydrate, sodium dichromate tetrahydrate orbarium chloride dihydrate. Using the following data identify the unknown.Wt. of crucible/lid empty 39.46 gWt. of crucible/lid/hydrate sample 46.84 gWt. of crucible/lid/sample after heating 45.77 gA. Prepare 100 plates of Mueller Hinton Agar using 100mm petri dish. (Manufacturer's instructions: Suspend 39 g of dehydrated powder in 1 liter of distilled or deionized water.) Pour 25 mL of prepared medium per plate. Express answer to the nearest whole number. How many grams of the dehydrated powder is needed? Answer: What is the volume of distilled water that should be used in the preparation? Answer: