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If you prepare a liter of 0.02 M acetic acid and 0.01 M sodium acetate, what will be the pH if the pKa of acetic acid is 4.76? b) If you add 1 ml of 5 M NaOH to the 1 liter above, what will be the new pH and the change in pH? c) If you add the same 1 ml of 5 M NaOH to 1 liter of pure water, what will be the pH and the change in pH? d) Which is the better buffer? Briefly explain.
if .350g sample of cinnabar is heated the org decomposes completly to leave .302 of pure mercury metal.what is the empirical formula of cinnabar?
What mass of this substance must evaporate in order to freeze 250 of water initially at 25? (The heat of fusion of water is 334 the specific heat of water is 4.18 .)
An aqueous solution is made by dissolving 24.5 grams of manganese(II) chloride in 466 grams of water.
a 7.95 L Container holds a mixture of two gases at 37 degrees celcius. the partial pressure of gas A and gas B, respectively, are .287 atm and .698 atm. if .210 mol a third gas is added with no change in volume or temperature.
what are the names of the quantity measured by each of seven SI base units and the SI symbols of the unit?
Calculate the pressure of 4 g of nitrogen gas in a 1 L container at 20.0 ?C.
If 2.0x10^-4 moles of S2O8. In 100 ml solutions is consumed in 120 seconds what is the rate law
The reaction A=B+ C is second order in A. when [A}0=0.100M, the reaction is 20% complete in 35 minutes. Calculate the value of the rate constant in ( L/min.mol)
when a .28 gram sample of limestone was decomposed by heating 75 millileters of CO2 at 750 mm Hg and 20 degrees celcius were evolved. How many grams of CO2 were produced?
You are given some reactions as a. Cl2(aq) + 2NaI(aq)= I2(aq) + 2 NaCl(aq), b. Br2(l) + 2K(S)=2KBr(s), c. Pbs( s) + 4H2O2(aq)= PbSO4(s) + 4H2O(l) you just need to Indicate which element is reduced and which is oxidized in the given equations?
1.50 g of nh3 react with 2.75g of o2 which is the limiting reactant? How many grams of excess remain after the limiting reactant is completely consumed?
Calculate the amount of heat required to completely sublime 78g of solid dry ice at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3kJ/mol .
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