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Suppose you have a solution that might contain any of the following cations: Ni^(2+), Hg^(+), Fe^(3+) and Ca^(2+). Addition of excess HCl causes a precipitate to form. After the precipitate is filtered off, excess Hsubscript(2)SOsubscript(4) is added to the filtrate and another precipitate forms. This precipitate is filtered off and a solution of NaOH is added to the filtrate until it is strongly alkaline. No precipitate is formed. Which ions are present in each of the precipitates? Which cations are not present in the original solution? Show your reasoning.
A 25.0-mL solution of 0.0430 M EDTA was added to a 48.0-mL sample containing an unknown concentration of V3 . All V3 present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a 0.0440 M Ga3 solution until all ..
what is the vapor pressure of the solution at 20 °C? Values at 20 degress celsius
You are a laboratory assistant for your chemistry course. There are 250 students in the course, and each needs to use 25 mL of a 0.15 M solution of copper sulfate.
Calculate the freezing point of a solution of 23.4 grams of benzoic acid (C6H5CO2H) dissolved in 613 grams of naphthalene.
at 25 degree c the heat of fusion of al is 10.6 kjmol and the heat of sublimation is 326.4 kjmol. what is the heat of
The recommended daily allowance (RDA) of calcium is 1200 mg. Calcium carbonate contains 12% calcium by mass. How many grams of calcium carbonate are needed to provide the RDA of calcium
An aqueous CaCl2 solution has a vapor pressure of 83.7mmHg at 50 C . The vapor pressure of pure water at this temperature is 92.6mmHg.
A gas cylinder that contains argon has an internal volume of 6.88 L. A pressure gauge attached to the cylinder reads 1870 psi (1 atm = 14.7psi) at 20.0C.
An aqueous antifreeze solution is 55.5% ethylene glycol by mass. the density of the solution is 1.071 g/cm3. calculate the molality. calculate the molarity. calculate the mole fraction.
All of the following are physical properties of a substance in a liquid state EXCEPT a.indefinite volume b.definite mass c.not easily compressed d.indefinite shape
What is the concentration of the vitamin C standard solution? Using a balance, 125mg of Vitamin C was weighed out and was added to a 100-mL beaker and dissolved in 50mL of DI water.
A compound of chromium and oxygen contains 18.9 g of the nonmetal and 41.1 g of the metal. How many grams of chromium are in 1.22 kg of the compound
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