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a.) Calculate the pH of a solution which is 0.50M acetic acid and 0.25M sodium acetate.
b.) What is the new pH of the solution after 6.50g solid sodium hydroxide is added to 1.00L of the solution and dissolved. (Assume there is no appreciable volume change with the addition of the solid.)
c.) What is the new pH of the solution after 0.200mol HCl gas is added to 1.00L of the solution and dissolved. (Assume there is no appreciable volume change with the addition of the gas.)
PCBs are transported through the environment in the vapor phase to Lake Superior. Let's assume that the flux to this lake is almost all due to rainfall, which has an average PCB concentration of 30 ng/L. The average depth of Lake Superior is 150 m..
How much heat is absorbed by 15.5g of water when its temperature is increased 20.0C to 50.0C?The specific heat of water is 4.184J/(g.C)
Consider this reaction involving an unknown element X. When 1.800 g of XBr reacts, 0.6758 g of Br2 is produced.
what is vapor pressure in mmhg of a solution prepared by dissolving 5.00 g of benzoic acid in 100g of ethyl alcohol at 35 degrees celcius? the vapor pressure of pure ethyl alcohol at 35 degrees if 100.5 mmHg
If I want to make the buffer by adding 0.100 M NaOH instead of sodium acetate, how many milliliters of NaOH are needed to reach pH=4.74?
write the net ionic equation, excess concentrated sulfuric acid is added to solid calcium phosphate
How would you prepare a sodium phosphate at pH 7. What species would you use, what concentrations. Remember phosphoric acid has three pKas
What are the percentages of each molecular ion? (List to nearest 1% in order of increasing mass separated by commas, e.g. 55,45.)
a freshman is currently enjoying the arts studio program she is pursuing at a well-known university. in her free time
What is the ph of the buffer that results when 12.0 g of NaH2PO4 and 8.00 g of Na2HPO4 are diluted with water to a volume of 0.50 L? ( ka of H2PO4 = 6.2 X10-8, the molar masses of NaH2PO4 and Na2HPO4 are 120.0 g/mol and 142.0 mol respectively)
concentrated hydrofluoric acid is 28.9M and has a density of 1.18g/mL. What is the weight percent of concentrated HF?
Describe the effects of a catalyst on a reaction; (what is changed what is not), include a rough sketch showing the reaction profile for an uncatalyzed reaction and a catalyzed reaction. Provide an example of a catalyzed reaction.
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