Which of the following is the best option for transferring 20 mL of a solution? Use a 20 mL Mohr pipette once Use a 10 mL Mohr pipette twice Use a 10 mL volumetric pipette twice Use a 5mL serological pipette 4 times Which of the following glassware is best used for drying solid samples in an oven? Beaker Crucible Erlenmeyer flask Watch glass Which of the following glassware is best used for slow dispensing of 47.00 mL of a solution? Mohr Pipette Volumetric Pipette Burette Graduated Cylinder

Which of the following is the best option for transferring 20 mL of a solution? Use a 20 mL Mohr pipette once Use a 10 mL Mohr pipette twice Use a 10 mL volumetric pipette twice Use a 5mL serological pipette 4 times Which of the following glassware is best used for drying solid samples in an oven? Beaker Crucible Erlenmeyer flask Watch glass Which of the following glassware is best used for slow dispensing of 47.00 mL of a solution? Mohr Pipette Volumetric Pipette Burette Graduated Cylinder

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter3: Statistical Tests With Excel

Section: Chapter Questions

Problem 6P

See similar textbooks

Similar questions

Drug: C20H22ClN (Flexeril also known as iCyclobenzaprine HCl Using unit analysis, clearly show the set-ups for your calculations. You wish to prepare 50.0 mL of 2.30 x 10–2 M solution of your drug. (hint-how many grams will you need of your drug?) Describe how to prepare this solution from the pure drug and deionized water. Analytical balances and volumetric flasks are available to you. (Assume that your drug dissolves in water, at least to the extent necessary for this problem.) Use complete sentences in your description of the solution preparation process. A patient is given 2.0mL of a 3.00% (m/v) solution of your drug, how many milligrams of the drug did they receive? What is the molarity of a 3.00% (m/v) solution of your drug?
Volumetric flasks show no intermediate gradations, but they show a single mark to indicate, with high precision, the volume they contain when they are filled to that mark. For most volumetric devices, "filled to the mark" means filled until the bottom of the meniscus of the contents is exactly coincident with the mark. In lab you prepared a standard solution having a concentration of 7 ppm. Using a buret, you transferred the required amount (7 mL) of the 40 ppm stock solution into a 100.0mL volumetric flask, added 2.0 mL sodium citrate solution, 2.0 mL of hydroquinone solution, 3 mL of phenanthroline solution, and diluted with distilled water to the mark. When you were finished, the final volume in your solution was 0.5cm above the mark. The solution you prepared is __________________ Question 7 options: less than 7 ppm because you added less solvent than necessary. greater than 7 ppm because you added less solvent than necessary. less than 7 ppm because you added more solvent than…
Only water or dilute aqueous solution or non toxic chemicals may be disposed of down the drain with copious water true false
a tank contains 100 gal of brine made by dissolving 80 lb salt in water. Pure water runs into the tank at the rate 4 gal/min and the mixture,kept uniform by stirring, runs out at the same rate. The outflow runs into a second tank which contains 100 gal of pure water initially and the mixture, kept uniform by stirring, runs out at the same rate. Find the amount of salt in the second tank after 1 hour
The total cation content of natural water is often determined by exchanging the cations for hydrogen ions on a strong acid ion-exchange resin. A 25.00 mL sample of a natural water was diluted to 100.00 ML with distilled water, and 2.06 g of a cation - exchange resin was added. After stirring, the mixture was filtered and the solid remaining on the filter paper was washed with three 15.00 mL portions of water. The filtrate and washings required 16.30 mL of 0.0282 M NaOH to give a bromocresol green end point. a) Calculate the number of millimoles of cation present in exactly 1.00 L of sample. b ) Report the results in terms of milligrams of CaCO3 per liter. Only typed solution.
Although other solvents are available, dichloromethane(CH₂Cl₂) is still often used to “decaffeinate” drinks because thesolubility of caffeine in CH₂Cl₂ is 8.35 times that in water.(a) A 100.0-mL sample of cola containing 10.0 mg of caffeine is extracted with 60.0 mL of CH₂Cl₂. What mass of caffeine re-mains in the aqueous phase? (b) A second identical cola sampleis extracted with two successive 30.0-mL portions of CH₂Cl₂.What mass of caffeine remains in the aqueous phase after each extraction? (c) Which approach extracts more caffeine?
A chemist receive different mixtures for analysis with the statement that it contain NaOH, NaHCO3 , Na2CO3 or compatible mixtures of these substances together with the inert material. From the data given, identify the respective materials and calculate the percentage of each component. 1.000g samples and 0.2500 N HCl were used in all cases. Sample 1 With phenolphthalein as the indicator, 24.32 ml of HCl was used. A duplicate sample required 48.64 ml HCl using methyl orange as the indicator. Sample 2. With phenolphthalein as the indicator it uses 28.2 ml of HCl to make it colorless and added with methyl orange indicator and uses 11.3 ml of HCl to reach the end point.
Prepare 50ml of approximately 1000ppm Mn stock solution from MnCl2*4H2)
A prescription was received for: 150ml Peppermint Water 2.5ml to be taken before feeds. The formula for peppermint water is given as: Concentrated peppermint emulsion 5ml Chloroform water, double strength 100ml(0.5% v/v) Purified water to 200ml If you only have concentrated chloroform water(10%) available in the pharmacy, how many ml would require for the above preparation? And what is the concentration of chloroform in the final mixture?
A sample may contain any combination of sodium hydroxide, sodium carbonate and sodium bicarbonate with inert matter. A 3.00g sample requires 57.57ml of 0.5N hydrochloric acid to reach phenolphthalein endpoint and a total of 105.4ml of acid was used until the methyl orange endpoint was reached. What is the percentage inerts in the mixture? What is the percentage sodium bicarbonate in the mixture? What is the percentage sodium hydroxide in the mixture? What is the percentage sodium carbonate in the mixture?
1) How many milliliters of 70% ethanol and 20% ethanol must be mixed to prepare 500ml of 30% ethanol? 2) A gaseous blend of nitric oxide and nitrogen (NOmax) contains 0.09% v/v nitric oxide (NO) and 99.92% v/v nitrogen. Express the strength of nitric oxide in PPM (round to whole number) 3) The ratio strength of a 10mL vial of neostigmine methylsulfate injection USP is 1:1500.Calculate the amount of neostigmine methylsulfate in milligrams contained in the 10mL vial. (Round to the whole number).
A solution of potassium phosphate contains a mixture of 164 mg of monobasic potassium phosphate (MWt: 136) and 158 mg of dibasic potassium phosphate (MWt: 174) per milliliter. If a hyperalimentation fluid calls for the addition of 45 mEq of potassium, how many milliliters of the solution should be used to provide this level of potassium? How many millimoles of total phosphate will be represented in the calculated volume of potassium phosphate solution?