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Describe the possible effect on your results of the following experimental errors. In each case, specify the component(s) whose percentage(s) would be too high or too low.
a) After adding dichloromethane to panacetin, you didn't stir or shake the mixture long enough.
b) During the NaOH extraction, you failed to mix the aqueous and organic layers throughly.
c) You mistakenly extracted the dichloromethane solution with 5% HCl rather than 5% NaOH.
d) Instead of using pH paper, you neutralized the NaOH solution to pH 7 using litmus paper.
what is the freezing point of a solution of 1.17 g of 1-naphthol c10h8o dissolved in 2.00 ml of benzene at 20degc? the
To measure the sample, 1.00 mL of a standard sample of butyl benzoate containing 2.59 mg/mL was mixed with 1.00 mL of the plant stream material, and analysis of the mixture gave a peak area of 463 for peak A and 425 for peak B. What is the concent..
If the heat of combustion for a specific compound is -1100.0 kJ/mol and its molar mass is 75.49 g/mol, how many grams of this compound must you burn to release 390.70 kJ of heat
Exactly 5.00 days later, the rate of decay was found to be 177 disintegrations per minute. Calculate the half-life, in days, for the decay of this sample.
What is the value of Delta S when 2.7g of CH4 is compressed from 29.0 L to 18.0 L at a constant temperature of 100 C?
Calculate the partial pressure of each, the total pressure and the composition of the liquid solution.
A voltaic cell consists of a Zn/Zn2+ half-cell and a Ni/Ni2+ half-cell at 25 ?C. The initial concentrations of Ni2+ and Zn2+ are 1.50M and 0.100M , respectively. The volume of half-cells is the same.
The resulting mixture exerts a pressure of 731 mmHg at 83°C. (a) What is the partial pressure of each gas in the container (in mmHg). (b) What is the mass of the original sample (in g)
The pressure on a sample of liquid water is increased from 1.00 bar to 100.00 bar at a constant temperature of 20 find h,u,q,and w. assume that the volume of the liquid water is constant
Having an initial concentration of an acid of 2.69*10^-4 and having volumes at the equivalence point of 22.38mL and 21.27mL, Calculate the concentration of the base of 0.10 M NaOH
Current annual energy consumption in the US is 99.7 quads. Assume that all this energy is to be generated by burning CH4(g) in the form of natural gas
8.0 mL of 10.0 ppm fe 2+ solution is diluted to 100.o ml. What is the concentration (in ppm) of the resulting solution?
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