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A limestone sample was analyzed for its calcium oxide (CaO) content. A 0.3333 g sample was dissolved in concentrated HCl. The calcium was precipitated by adding an excess of ammonium oxalate and sufficient ammonia to render the solution basic. The precipitate was filtered, washed, and then redissolved in dilute H2SO4. The oxalic acid formed in the solution required 43.33 mL of 1.888 x 10-2 M KMnO4 solution for complete titration. Calculate the percent calcium oxide in the limestone sample. You will need to write a balanced equation for the reaction that takes place during the titration
what is the percent ionization of a solution made by adding 6.00 grams of ch3cooh to 100 g of water kb 0.512 ? cm if
1,10-Phenanthroline forms a bright red complex with iron(III). The complex has an analytical wavelength of 510 nm and has a high molar absorptivity. Hydroxylamine hydrochloride is added to keep the iron in a reduced +2 state
How many grams of (NH4)2SO4 should be present to prevent precipitation of Mg(OH)2 (s). The Ksp of Mg(OH)2 is 1.8x10^-11.
a 0.5224-g sample of an unknown monoprotic acid was titrated with 0.0998M of NaOH. the equivalence point of the titration occurs at 23.82ml. Determine the molar mass of the unknown acid
Exactly 100 mL of 0.10 M nitrous acid (HNO2) are titrated with a 0.10 M NaOH solution. Calculate the pH for the following. (a) the point at which 80 mL of the base has been added
What is the pH of a buffer solution that is 0.255 M in lactic acid and 0.333 M in sodium lactate? The Ka of lactic acid is 1.4 × 10-4.
The empirical formula for acetic acid is CH2O. Its molar mass is 60 g/mol. what the molecular formula is?
[H+] of the rainfall over Washington, DC is 3.163*10-5 moles/liter. what is the ph of the rainwater
Water has seeped through the pore spaces in the glass cup. 4. The relative humidity of the air near the glass cup is approaching 0 percent. 5. The dew point temperature was not reached.
What is the de Broglie wavelength in cm, of a 11.9 g hummingbird flying at 1.12 102 mph? (1 mile = 1.61 km.)
A buffer is prepared by dissolving HONH2 and HONH3NO3 in some water. Write equations to show how this buffer neutralizes added H+ and OH
An automobile gasoline tank hold 21kg of gas. When the gasoline burns, 84kg of oxygen is consumed and carbon dioxide and water vapor are produced. What is the total combined mass of carbon dioxide and water that is produced?
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