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Problem- Consider 250.0mL of a pH 3.50 buffer made with sodium fluoride and hydrofluoric acid with a combined concentration of 0.250 M. a) Write an equation to represent the buffer. b) Calculate how many grams of sodium fluoride and hydrofluoric acid are needed to prepare the buffer. c) Calculate the pH of the buffer after 15.0 mL of 0.10 M NaOH is added to 50 mL of buffer.
I need proficient help to solve the above problem
but did not exactly add 4.0 mL. Instead he added 4.50mL. What was the final concentration of her standardized solution in ppm?
Imagine that you have a 5.50 L gas tank and a 2.50 L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch.
Calcium carbonate reacts with hydrochloric acid to forma a salt, carbon dioxide and water. Write the balanced equation and determine how many grams of salt will be produced of 50g of calcium carbonate was used?
How many moles of nitrate ions are present in a sample that contains 4.82 moles of chromium(III) nitrate, Cr(NO3)3
The same apparatus is then filled with an unknown gas at 32.3 C to a pressure of 645 mm Hg. It takes 5 hours 34 minutes and 25 seconds for the pressure to fall to 207 mm Hg. Calculate the molar mass of the unknown gas.
Question- If 2.0 g of gold is used to be plated out of 1.0 L of 0.5 M solution of Au3+. How long (seconds) would a current of 18A have to flow in order to plate out 90% of the remaining Au3+ in the solution
The half-life of carbon-14 is 5715 years. If an animal bone contains 20.0 grams of carbon-14 when the animal dies, how many grams of carbon-14 will be left in 17145 years (3 half-lives)
What colligative properties are displayed by these situations.
A 10.00 mL aliquot of weak base is titrated with HCl. The equivalence point is reached after 17.21 mL of 0.4332 M HCl has been added. The pH is equal to 10.03 after 5.00 mL of HCl was added. Determine:
the temperature of the calorimeter (including its contents) rose from 23.18oC to 27.65oC. What mass, in g, of benzoic acid was burned. here is what i did, 3226/122.13=26.41 delta t =4.474 so 4.474*12.5/26.41 =2.12 is the answer 2.12g
The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name and origin imply, it stinks!
the combustion of ethane produces carbon dioxide and steam2c2h6 7o2 --- 4co2 6h20how many moles of co2 are produces
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