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Flamephotometric determination of sodium is based on the measurement of the absorbance, A, on three standard solutions with known concentration of sodium ions:
Data: ([Na+]; A): (0.10mM; 0.520)-(0.20mM; 0.705)-(0.40mM; 0.950). Plot the standard curve using the figure to the right:
A solution is prepared from 34.0 mg of sodium bromide (M=102.9g/mol) dissolved in water (V=100 ml). This solution is out of the measuring range and needs to be diluted.
Suggest how many times this solution should be diluted to give a concentration within the measuring range. Predict the absorbance (A) of the this diluted solution.
Give the name of the most probably side product with the high melting point. d. Explain, with the aid of a mechanism, the role of H2SO4 in the reaction
Determine the ion notation for an atom with 18 electrons and 20 protons
carbon disulfide cs2 is an important industrial substance. its fumes can burn explosively in air to form sulfur dioxide
A truck is initially 6.0km north of the gas station and is moving with a constant speed of 45km/h due south. How far are the vehicles from the gas station when they pass each other
Calculate the equilibrium partial pressures of O2, NOCl, NO2, and Cl2. Peq(O2) = . Peq(NOCl) = . Peq(NO2) = . Peq(Cl2) = . (b) Calculate KP for this reaction. KP
Few enzymes have one or more sulfhydryl (thiol) groups that are significant to enzymatic activity but that can react upon standing in solution to form inactive disulfide bonds.
Explain what is the minimum mass of ethylene glycol that must be dissolved in 14.5 kg water to prevent the solution from freezing at -23.0 Celsius. Assume ideal behavior
Radioactive radon gas (222Rn) enters an average building at a rate of 5 picocuries per second per square meter of foundation area. Consider a house with a foundation of 400 square meters and a volume of 1000 cubic meters.
Devise at least two ways that carbon dioxide emissions could be reduced without reducing the ammonia production rate (400 tons/day)
2HI(g)------H2(g)+I2(g) Kc=0.0200 at 745 K suppose 1.00 mol HI9g) and 1.00 mol H2(g) are placed in a 10.0 L Flask and heated to 745 K. What are the concentration of each substance when equilibrium is reached
which has the most mass. which has the least. which has the most number of atoms. which has the least. which has highest density. which has the least. Do the most atoms always correspond to most mass.
0,245g of the carbonate was found to exactly neutralise 23,6cm3 of HCl with a concentration of 0,150 mol/dm3.
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