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An unknown sample of Cd2+ gave an absorbance reading of 0.259 in an atomic absorbtionan analysis. then 0.5 mL of solution containing 4 ppm of CD2+ was mixed with 50.0 mLof the unknown sample. this solution gave an absorbance reading of 0.368.
(A) denoting the initial, unknown concentration CD2+, write an equation to calculate the final concentration , CD2+ considering the dilution factor, units are ppm.
(B) In a similar manner, write the final concentration of added Cd2+ standard, designated as [S] known.
(C) Find the concentration of Cd2+ in the unknown.
Given that the nuclidic masses of 238U = 238.0508 amu and an a particle = 4.0026 amu, calculate the mass of 234Th in units of g/mol.
Simplest and most informative way to characterize a carboxylic acid is to determine its neutralization equivalent. The number of carboxyl group in the molecule of the following compound is 1.
As a chemist for an agricultural products company, you just developed a new herbicide,Herbigon, that you think can kill weeds effectively. A sparingly soluble salt,
Draw the Lewis structure for each of the following molecules or ions, and predict their electron-domain and molecular geometries.
How much heat is required to warm 229 g of ice from -44.9C to 0.0C, melt the ice, warm the water from 0.0C to 100.0C, boil the water, and heat the steam to 173.0C.
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.150 M HClO(aq) with 0.150 M KOH(aq). The ionization constant for HClO is 4.0*10^-8
Cd2+, Co2+ is saturated with H2S at a pH of 3.00. Which metals form a sulfide solid? [H2S]sat=0.10 and Ka1= 1.3e-7 and Ka2=8.5e-14
A sample of gas occupies 2.78 x 103 mL at 25oC and 760 mm Hg. What volume will the gas sample occupy at the same temperature and 475 mm Hg?
2 Al2O3(s) → 4 Al(s) + 3 O2(g) . ?H = +3339.6 kJ/mol What is ?H for the formation of one mole of Al2O3(s) from the elements?
If the end of the crutch is a circle of radius 1.2 cm without the tip, and the tip is a circle of radius 2.3 cm, by what factor does the tip reduce the pressure exerted by the crutch?
Enter the molecular, ionic and net ionic equation for the following reactioins. I am having trouble figuring out when to make the water molecule and when not to.
A modern sample gives 920 disintergrations/h. Estimate the age of the Scrolls from these data
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