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Determine the mass of solid sodium formate of MW 68.0 must be combined to 150 mL of 0.66 mol/L HCOOH to make a buffer solution having a pH =3.85? given that Ka for formic acid= 0.00018.express your answer in units of g
What volume of hydrochloric acid solution of 0.25 M must be diluted to prepare 1.00 L of 0.040 M HCl and calculate Keq at this temperature for the given reaction 2 NOCl (g) W 2 NO (g) + Cl 2 (g) ( reaction is at equilibrium):
A buffer that has .370 m base and .234 m of its conjugate acid contain ph of 9.09. what is the ph after .002 mol of HCL is added to .250 l of this solution.
Evaluate the energy of an electron excited from a hydrogen atom using Bohr's model. Determine the maximum wavelength of energy needed to observe a photoelectric effect for potassium.
In a second experiment, I(electric current) broke down a sample of H 2 O into 1.45 grams of hydrogen and 11.51 grams oxygen. Are these results reliable with the law of exact extent?
Find the Qsp if The solubility product of Ag 2 CO 3 =6.2 × 10-12. Also determine whether a precipitate forms in the solution (Assume 20 dropsper milliliter.)
15.0 moles of gas are in a 5.00L tank at 22.2°C. compute the difference in pressure between CH4 and an ideal gas under these circumstances. The van der Waals constants for CH4 are a=2.300L2⋅atm/mol2 and b=0.0430 L/mol.
A distance of 200 ft must be taped in a manner to ensure a standard deviation smaller than ± 0.03 ft. What must be the standard deviation per 100 ft tape length to achieve the desired precision?
We are asked to explain the pH and how to find hydrogen ion concentration - Find the pH of an acidic substance of your choice.
Find the new volume of the gas sample - What is the new volume of the gas sample
Element symbols and Chemical formulas - What is the total number of atoms found in each of the following compounds? What is the total number of elements found in each?
477 J amount Energy is added to a 74.0 grams sample of H 2 O at a temperature of 21 degree Celsius. Determine what will be the final temperature of the H 2 O?
using a sample of river water sample analyzed for total inorganic carbon ,The river pH= 7.1 and an inorganic C concentration of 6.97 mg C/L.c
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