If your curvette had been dirty, how would this haveaffected the

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June 28, 2019

Application of Standards of Care.

June 28, 2019

Published by admin at June 28, 2019

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How do I calculate the equilibrium constant?

if a piece of sulfur weights 227g when submerged in a

if a piece of sulfur weights 227g when submerged in a graduated cylinder containing 50mL of H20 the level rose to 150mL. what would the density (g/mL) of sulfur be ?

A 36.3 mL aliquot of 0.0529 M H2SO4 is to be

A 36.3 mL aliquot of 0.0529 M H2SO4 is to be titrated with 0.0411 M Na A 36.3 mL aliquot of 0.0529 M H2SO4 (aq) is to be titrated with 0.0411 M NaOH (aq). What volume (mL) of base will it take to reach the equivalence point?

When 225mL of H2O at 25 degrees Celsius are mixed with

When 225mL of H2O at 25 degrees Celsius are mixed with 85mL of water at 89 degrees Celsius, what is the final temperature? (Assume no heat is lost to the surroundings)

This question looks tricky but if you read it carefully, its

This question looks tricky but if you read it carefully, its easier than it looks. For extra practice you can also find the partial pressure of the other gas, as well as the total pressure, once the valve is opened. Two gases are contained in gas bulbs con- nected by a valve. Gas A is present in a 59 L bulb at a pressure of 441 torr. Gas B exerts a pressure of 630 torr in a 82 L bulb. What is the partial pressure of gas B after they equilibrate once the valve has been opened? Answer in units of torr.

A 661 mL gas sample at STP is compressed to a

A 661 mL gas sample at STP is compressed to a volume of 112 mL, and the temperature is increased to 35◦C. What is the new pressure of the gas in Pa? Answer in units of Pa.

Consider the reaction 4KO2(s) 2CO2(g) ! 2K2CO3(s) 3O2(g) .

Consider the reaction 4KO2(s) 2CO2(g) ! 2K2CO3(s) 3O2(g) . How much KO2 is needed to react with 75.0 L of carbon dioxide at STP? 1. 13.4 mol 2. 6.70 mol 3. 0.838 mol 4. 1.67 mol 5. 3.35 mol

A gaseous reaction occurs at a constant pressure of 35.0 and

A gaseous reaction occurs at a constant pressure of 35.0 and releases 60.1 of heat. Before the reaction, the volume of the system was 7.40 . After the reaction, the volume of the system was 2.60 .

SEPARATION AND ANALYSIS OF DRUG COMPONENTS Answer the questions in this

Get college assignment help at uniessay writers SEPARATION AND ANALYSIS OF DRUG COMPONENTS Answer the questions in this assignment. Your lab report should include a discussion section where you discuss your results and explain your understanding of the experiment. This assignment is in addition to that discussion and does not substitute for it. Q1. Your class mate obtained the melting point of the solid obtained from vial C. He found it out to be113 °C – 135 °C. a. Is this what you would expect for a pure compound? Since this is not what you’d expect for a pure compound, what impurity is likely to be present? b. Explain how this impurity formed using a chemical equation. (1 Point) c. Is it possible to determine the percentage of the impurity formed? If yes, what was the mole percent of the impurity formed? (There are two possible answers—remember melting point?) (1 Point) d. What changes will you make to the experimental method so that this impurity does not form? Explain in detail. (1 Point) Q2. Organic compounds containing basic functional groups, such as amines, —NR2, can be converted into their water-soluble hydrochloride salts by treating them with dilute hydrochloric acid. Several drugs containing the basic amine functionality are formulated as their hydrochlorides, not just to improve their pharmacokinetic properties, but also to make them water-soluble. An example of a drug with an amine functional group is diphenhydramine (Benadryl), used for relief of certain allergy symptoms. Its amino group is protonated by dilute HCl; the structure of the hydrochloride salt is as follows: The pKa of diphenhydramine hydrochloride is 9.12. a. If a small amount of diphenhydramine hydrochloride is dissolved in excess aqueous 5% NaHCO3, what is the molar ratio of diphenhydramine and its conjugate acid? (1 Point) b. At what pH would the ratio of diphenhydramine to its conjugate acid be 1000? Show your work. (1.5 Points) c. Ten-stubs Needleman, a compounding pharmacist of dubious reputation, meant to mix diphenhydramine hydrochloride with aspirin, but he accidentally mixed it with phenacetin instead. To make matters worse, he put the mixture next to his morning coffee and accidentally added a teaspoon of sugar to the mixture. He has asked you to help him recover pure diphenhydramine from the mixture. Provide a flow chart for the isolation of diphenhydramine. Diphenhydramine is soluble in dichloromethane and hot water, and it is sparingly soluble in cold water, from which it can be recrystallized. Diphenhydramine hydrochloride is very soluble in cold water. The chemicals available are dilute NaOH solution, 5% NaHCO3 solution, 5% HCl solution, and dichloromethane. The equipment available includes all of the equipment available in this exercise. (4 Points)

A 5.325 g sample of methyl benzoate was found to contain

A 5.325 g sample of methyl benzoate was found to contain 3.758 g of carbon, 0.316 g of hydrogen, and 1.251 g of oxygen. What is the empirical formula? If its molar mass is about 130 g/mol, what is the molecular formula?

a buffer (pH 4.74) was prepared by mixing 1.00 mole of

a buffer (pH 4.74) was prepared by mixing 1.00 mole of acetic acid and 1.00 mole of sodium acetate to form an aqueous solution with a total volume of 1.00 liter. To 200 mL of this solution was added 104 mL of 0.50 M NaOH. what is the pH of this solution?

can you please help me with number 8?

Consider the following reaction. H2O(g) CO(g) H2(g) CO2(g) In

Consider the following reaction. H2O(g) CO(g) H2(g) CO2(g) In a particular experiment 1.0 mol H2O(g) and 1.0 mol CO(g) are put into a flask and heated to 350°C. In a second experiment 1.0 mol H2(g) and 1.0 mol CO2(g) are put into another flask with the same volume as the first. This mixture is also heated to 350°C. After equilibrium is reached, will there be any difference in the composition of the mixtures in the two flasks?

A 11.50 mL sample of this stock solution is added to

A 11.50 mL sample of this stock solution is added to 51.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final solution.

A Be3 ion emitts a photon with a frequency of 4.68

A Be3 ion emitts a photon with a frequency of 4.68 × 1016 Hz. If the energy of the initial state of the Be3 ion was -3.88 × 10(-18) J, calculate the energy of the final state. Express answer in scientific notation.

In an experiment, 225 mL of wet H2 is collected over

In an experiment, 225 mL of wet H2 is collected over water at 27 °C and a barometric pressure of 748 torr. How many grams of Zn have been consumed? The vapor pressure of water at 27 °C is 26.74 torr

1. Assign oxidation numbers to each element in the following compounds:

1. Assign oxidation numbers to each element in the following compounds: (6 marks) (a) VOCl3 (b) CuSO4 (c) CH2O (d) Mn2O7 (e) OsO4 (f) H2PtCl6

If the Ksp of KHT was determined experimentally to be 3.8E-4

If the Ksp of KHT was determined experimentally to be 3.8E-4 at 25 C, calculate the mass of KHT needed to make 200 mL of saturated solution.

A student placed 18.5 g of glucose ( C_6H_{12}O_6) in a

A student placed 18.5 g of glucose ( C_6H_{12}O_6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform. A 60.0 mL sample of this glucose solution was diluted to 0.500 mL. How many grams of glucose are in 100. mL of the final solution?

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