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A) a sodium hydroxide solution is standardized using 0.50g of solid oxalic acid, H2C2O4. Find the molarity of the base if 30.20 mL are required for the titration of phenopthalein endpoint. H2C2O4(s) + NaOH(aq) ---> Na2C2O4(aq) + H2O (l)
B)A. 10.0 mL sample of household ammonia solution requires 33.55 mL of 0.450 M HCl to reach neutralization. Calculate (a) the molar concentration of the ammonia and (b) the mass/ mass percent concentration of ammonia (17.04 g/mol), given a solution density of 0.983 g/mL. HCl + NH3 ---> NH4Cl(aq)
A solution contains a mixture of Cl- and Br- ions. Can both be positively identified? Briefly explain. Write appropriate equations to support your answer.
Given the following substances and their melting points, hydrogen, -259 degrees Celsius, ethyl alcohol, -114 degrees Celsius, water, 0 degrees Celsius, sucrose, 186 degrees Celsius, and calcium chloride, 772 degrees Celsius
Magnesum metal will burn in carbon dioxide gas to produce carbon and magnesium oxide. What mass of magnesium will react with a 250.0 ml container of carbon dioxide gas at 77.0 degrees celsius and 65.0 kPa.
the heat formation of Al2O3(s) is delta H final is -1669 kj/mol. calculate the heat evolved when 0.267 g of Al burns in oxygen
By substituting two hydrogen atoms on the benzene ring with methyl groups, write line-angle formulas of all constitutional isomers. Name each isomer.
The problem: CaCO3 can be roasted to produce CaO and CO2. This reaction is carried out in a flash connected to an open-end mercury manometer when the atmospheric pressure is 754 torr.
Determine how many grams of methane is required to form 43.0 grams of CHCl3?
Our stock solutions are 0.2M EDTA, 0.04 M NaF and 1.2 M potassium phosphate. What volumes of the stock solutions should be measured?
A microwave oven operates at 2.70 . What is the wavelength of the radiation produced by this appliance
An unknown is believed to be an alcohol because the IR spectrum showed broad absorption at 3200-3500 cm-1 and no absorption in the 1700-1750 cm-1 region.
Determine the molecular formula for the unknown if the molecular mass is 60.0 amu and the empirical formula is CH2O.
A 9.0×10-2 M solution of a monoprotic acid has a percent dissociation of 0.60%. Determine the acid ionization constant Ka for the acid.
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