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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.
According to the laws of probability, the chance of two independent events occurring simultaneously is which of the following: (a) the sum of the individual probabilities, or (b) the product of the individual probabilities
The equilibrium constant K for a neutralization reaction can be symbolized as Kn. Utilizing Kw Ka, and Kb values, find out Kn for the subsequent reaction at 25° C.
An evaluation of R was performed, following the procedure described in this module. The barometric pressure was 736 torr, the temperature was 295 K, and the volume of hydrogen gas collected was 35.6 mL. The calculated value of R was 82.1mL atm K-1..
What salt is produced in each of the following neutralization reactions?
A 0.040 M solution of a monoprotic acid is 14 percent ionized. Calculate the ionization constant of the acid.
An unopened soda can has an aqueous CO2 concentration of 0.0506 m at 20 celcius. What is the pressure of CO2 gas in the can
What volume H2 can be produced at 780 mm Hg and 15 degrees Celsius from 1 mole Al, 1 mole NaOH and 2 moles H2O. --> Al(s) + NaOH(aq) + H2O (l) ---> NaAl(OH4) (s) + H2(g)
Why is it possible to separate the product (6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone) from sodium hydroxide using acetone?
consider a .7 L of a buffer composed of 0.4 M HClO and 0.5 NaClO? How many moles of strong base could this buffer withstand?
a production facility heats various equipment using a network of heated air and water vapor lines. a boiler produces a
protein a has a binding site for glucose with a kd of 10-5m.protein b has a binding site for glucose with a kd of 10-7
2. 0.33g of KOH is dissolved in 350.0ml of ethanol and 1.45g of C2H5I is dissolved in 350.0ml of ethanol. Assuming the reaction is first order, when equal volumes of the two solutions are mixed, what is the initial rate at 40oC?
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