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In this experiment, 0.150 g of a mixture, containing 0.100 g of a neutral unknown compound and 0.050 g of a benzoic acid impurity, is dissolved in 4.0 mL ether. The mixture is extracted two times with 2.0 mL of NaOH ultimately separating the neutral compound and the benzoic acid. Which compound remains in the ether and which compound moves to the aqueous NaOH? Provide the chemical reaction that occurred when NaOH was added. Show all lone pair electrons and formal charges. Clearly indicate the difference between an ionic bond and a covalent bond.
You analyzed the C18 content of a sample of ground beef. You took 5 g of beef, homogenized into buffer and centrifuged. The volume of the supernatant was 14 ml.
An aqueous solution containing 35.0% by mass of an unknown covalent compund in water was found to have a freezing point of -3.5 deg C. Calculate the molar mass of the unknown compund.
Suppose you wished to control the PO43- concentration in a solution of phosphoric acid by controlling the pH of the solution. If you assume you know the H3PO4 concentration, what combined equation would be useful for that purpose? Include physical..
Which of the following is (are) formed in the reaction between propyl hexanoate and methylamine. (must select all products which are formed in this reaction)
Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H2C2O4 and H2O in the balanced reaction
what is the work in joules done on the system to compress He gas from 24.0 L to 12.5 L against a pressure of 1.5 atm at a constant temperature of 37.4 C?
Show how each of the following compounds could be prepared from 3-pentanone. In most cases more than one synthetic transformation will be necessary.
A sample of gas with a volume of 750 mL exerts a pressure of 98 kPa at 30 c. what pressure will the sample exert when it is compressed to 250 mL and cooled to -25 degree celsius.
What is the activation energy for this reaction? a) 112 kJ/mol. b) 56 kJ/mol. c) 28 kJ/mol. d) 336 kJ/mol. e) 448 kJ/mol.
the epa limit for lead in the water supply is 15 parts per billion by mass. calculate the number of lead ions present
What mass of HClO4 should be present in 0.600 L of solution to obtain a solution with each of the following pH values pH = 2.70? pH = 1.70? pH = 0.60
How to Separate and isolate following compounds: 50% ethyl 4-aminobenzoate, 40% of benzoin, and, 10% 1-4 dibromobenzene.
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