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Background: This problem deals with preparation of a standard solution of KNO3. To do this, you might transfer an exact mass of solid KNO3 to a volumetric flask, dissolve the KNO3 in water, and then dilute the solution to the mark on the neck of the volumetric flask. In this example the volumetric flask you want to use contains some old KCl solution. You will need to discard the contents of the flask, then rinse it once or several times, before proceeding to prepare the standard solution of KNO3. Your final KNO3 solution will contain some residual chloride, depending on the the effectiveness of your rinsing procedure.
A 500-mL volumetric flask containing 0.526 M KCl is emptied and allowed to drain briefly, leaving 1.24 mL of liquid in the flask. The flask is then rinsed with 64.6 mL of distilled water and is then used to prepare a standard solution of KNO3. Compute the molar concentration of Cl- in the standard KNO3 solution if the flask is rinsed only one time with distilled water.
Assume that 1.24 mL of liquid remains in the flask each time it is emptied, and that this volume of rinse water remains in the flask prior to preparation of the KNO3 solution. Although in practice rinse volumes are generally approximate, for purpose of calculation please use the exact volumes indicated.
13.00 moles of gas are in a 5.00 L tank at 22.6 C. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a = 2.300 L^2*atm/mol2 and b = 0.0430 L/mol.
H2 and Cl2 combine to form HCl. In a gas phase equilibrium mixture of H2, Cl2, and HCl at 300 K, [HCl] = 0.0036 mol/L and [Cl2] = 0.00485 mol/L.
Calculate the amount of N2 gas released (in liters at 37° C and 1.5 atm) when the diver returns to the surface of the water, where the partial pressure of N2 is 0.80 atm.
Consider the following reaction. N2 + 3H2 -> 2NH3 . 28.0 grams of N2 and 5.04 grams of H2 are reacted, producing 17.8 grams of NH3. What is the percent yield?
The concentrations of lead in blood samples are often reported in units of micromoles of lead per liter of blood. Calculate the value of the concentration in these units of a blood sample containing 45 ppb lead.
is independent of pressure. By doing so, obtain an expression for V as a function of T and ? at fixed P.
A certain gaseous oxide of sulfur has an effusion rate that is 0.707 times the effusion rate of oxygen gas. What is the most likely molecular formula of this oxide?
hydrochloric acid for neutralization. A 12.0mL volume of a phosphoric acid solution requires 35.1mL of the sodium hydroxide solution for complete neutralization.
Suppose that 0.3 g of AlOOH (FM 59.99) plus 150 mL of 3M KOH are diluted to 1L to give the same species produced by Al(OH)3. Write mass balance equations for aluminum and potassium.
What is the molecular weight of a gas if a 250 mL sample of this gas collected over water at 735 mm Hg and 28.0°C has a mass of 1.25 gram? The equilibrium vapor pressure of water at 28.0°C is 28.3 mm Hg.
the xy-plane and the C-atom skeleton lies on the x axis, what is the hybridization of C for the right-side CH2 group?
what is the balanced molecular equation for the reaction between lithium phosphate
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