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1. A buffer system contains 0.18 MNH4+ and 0.14 M NH3. pKa of NH4+ is 9.25. How many moles of NaOH must be added to 1.00 L of this solution to increase the pH to 9.25?
2. Titration of a 15.0 mL solution of KOH requires 17.0 mL of 0.0250 M H2SO4 solution. What is the molarity of the KOH solution?
3. A 0.22 M solution of HCl is used to titrate 35.0 mL of a Ca(OH)2 solution of unknown concentration. If 140 mL of HCl is required, what is the concentration (in molarity) of the Ca(OH)2 solution?
An aqueous CaCl2 solution has a vapor pressure of 82.2 mmHg at 50 degrees C. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass percent
Question- I am trying to write up a lab report where I used colorimetry to check the absorbance of a reagent with different concentration of solution but I'm having a tough time using my calibration curve to determine the concentrations of unknown..
A 12 mL sample of a solution of AlBr3 was diluted with water to 42 mL. A 30 mL sample of the dilute solution was found to contain 2.26 M Br-. What was the concentration of AlBr3 in the original undiluted solution
How many grams of Helium does a 25.0 Liter balloon contain at 102.0 kPa and 24 degrees Celsius?
under certain conditions, the combustion of charcoal (C) in the presence of o2 forms carbon monoxide (CO) according to the given balance equation.
which of the following ethers has the highest boiling
When 1 of a fuel is burned at constant pressure, it produces 3452 of heat and does 13 of work. What is the value of delta H for the combustion of the fuel?
show the photoelectron spectrum of N2.Assign short and long progression band.. which one is adiabatic band. give your explanation on basis of FCP. No google copy- paste thing please.
Problem- The typical energy differences for transitions in the microwave, IR, and electronic spectroscopies are 5x10^-22 J , 0.5x10^-19 and 1x10^-18 J. Calculate the ratio of the number of molecules in two adjacent energy levels at 300 K in each c..
A sample of gas occupies 250. mL at 37 degrees celsius and 730. torr; what volume would the gas occupy at standard conditions?
Separator conditions are 100 psig and 90 degrees F. The well has just been completed; reservoir pressure is believed to be above bubble-point pressure. Estimate a value of solution gas-oil ratio for use at and above bubble-point pressure.
an inert gas has a volume of 941 ml at temperature 28 oC and pressure 675 Torr. What volume does the gas occupy at standard ambient temperature and pressure (SATP)?
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