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0.425-g sample of an antacid is dissolved in water. To the mixture is added 30.00 mL of 0.50 M HCl. The solution is then titrated to the endpoint with 9.82 mL of 0.50 M NaOH. what volume of acid is
By experiment, it isfound that 1.2 ×10-3mol of lead(II) iodide,PbI2, dissolves in 1.0 L of aqueous solution at 25ºC. What is the solubility product constant at this temperature?
A substance gives a positivexanthoproteic test and a positive Hopkins-Cole test but a negativebiuret test. What might the substance be?
Why do you suppose only symmetrical ethers are prepared by the sulfuric acid -catalyzed dehydration procedure?
The heat fusion of pure silicon is 43.4 kJ/mol. How much energy would be needed to melt a 5.24 - g sample of silicon at its melting point of 1693 K?
If 226 kJ of heat increases the temperature of 47.0 kg of copper by 12.5 degrees Celsius, what is the molar heat capacity of copper?
CO(g)+Cl2(g)↔COCl(g)+Cl(g) . Kenetic studies indicate that the rate constant for the forward reaction,Kf is 1.38x10-28 M/s; for the reverse reaction kR= 9.3x 1010M/s( both rate con
At 450 K the equilibrium concentrations for the followingreaction were measured and used to calculate the Kc value of0.0321. What is the value of Kp for the reverse reaction under same conditions?&n
Suppose you have separated molecules from a mixture by column chromatography, and there is a color overlap.What do you think might be the cause and how could the procedure be modified to get a bette
Calculate the amount of ammonium chloride that must be dissolved in 0.75L of water to produce a solution of pH 5.25 Please show all your work and explain.
Air is 78.0% Nitrogen molecules and 21% Oxygen molecules. What is Nitrogen partial pressure at atmospheric pressure of 1 atm?Assume ideal behavior.
What is the pH of a buffer solution containing 35.0 g of NH4Cl dissolved in 1.00 L of 1.00 NH3?Kb of NH3 = 1.8 x 10-5 How many moles of HCl are required to change the pH of this solution by
Determine the concentration of the species present at equilibrium if 0.10 mol of ethylenediamine is dissolved in 2.00 L of asolution that contains 6.5 x 10-3 M Ni2+.Kf of [Ni(en)3]2+
What mass (ingrams) of water would he need to perspire in order to maintain his original temperature? (It takes 44.0 kJ to vaporize 1 mole ofwater.)
If a sample of solid NaNO3 is weighed and submitted to acation exchange, an aqueous solution of what substance (compound)will emerge from the bottom of the Amberlite resin column?
Explain what happens to volume on the molecular level when the number of moles of gas is increased at a constant pressure and temperature.
What is the molar concentration of the cleaning solution formed when 25.0 L ammonia gas,measured at 31°C and 735 torr, dissolves in enough water to give a final volume of 0.675L?
A cook uses a microwave to heat a meal. The frequency of radiation is 2.45 x 10^9 s^-1. What is the energy of one mole of photons of this microwave radiation?
When 42.0 mL of HCl of unknown concentration react to completely dissolve a sample of magnesium metal according to the reaction below, 0.193 L of hydrogen gas were collected at 20.5 °C and apres
If Ka is 1.85 x 10^-5 for acetic acid, calculate the pH at one half the equivalence point and at the equivalence point for a titration of 50 mL of 0.100 M acetic acid with 0.100 M NaOH.
What is the molar concentration of the cleaning solution formed when 25.0 L ammonia gas,measured at 31°C and 735 torr, dissolves in enough water togive a final volume of 0.675L?
Diamond has a face-centered cubic unit cell, with four more Catoms in tetrahedral holes within the cell. Densities of diamondsvary from 3.01 g/cm3 to 3.52 g/cm3 because Catoms are missing
Why has the dehydration of cyclohexanol to cyclohexene been the traditional experiment to illustrate the acid-catalyzed dehydration of an alcohol to an alkene?
You are expected to use 35 square centimeter piece of aluminum froma used beverage can. What is the average thickness of such beveragecans if you have 1.00gram of metal from this piece ?
What volumes of equimolar aq soloutions of K2HPO4 and KH2PO4 must you combine to make a 900ml solution of the PH of 7.00 buffer?