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A white solid is known to consist of one or more of the following compounds: AgNO3 , Na2CO3, CaCl2, and Pb(NO3)2. A sample of the solid is treated in the following manner: When cold water is added and the mixture is stirred, a white precipitate formed in the solution which remains even after the solution is boiled. The solution is centerifuged and decanted. The precipitate is separated into two parts, which are then treated as follows: When cold 3M HNO3 is added to one part until the solution is acidic, the precipitate remains, even after heating to boiling. For each solid, indicate wheter these results indicate the presence or absence from the sample.
What is the pH of a solution made by mixing 25.00mL of 0.200M CH3COOH with 10.00mL of 0.200M NaOH? Ka of acetic acid is 1.8 x 10^-5.
using as sample of gas of 12.0 moles nbspare in a tank of 8.00 litres at the temperature of 22.6 degree celsius.
A test solution is made basic and drops of 0.1 M Ca(NO3)2 are added but no precipitate forms. What will occur next. Is this an acidic solution. Does a precipitate form. Explain.
Some ice cubes at 0 degrees celsius with a total mass of 335 g. are placed in a microwave and subjected to 750. W of energy for 5 minutes.
the vapor pressure of mercury Hg is .00180 mmHg at 77F. if Hg vapor reached equilibrium at this temperature in an enclosed space, what would the concentration of Hg be in the space. Assume normal atmospheric pressure.
What was the rate of production of 24Na in a 30-m reactor irradiation of 23Na if the activity of 24Na was found to be 1.0 mCi 3 h after the end of irradiation
A sample of air contains 78.08 % N2, 20.94% O2, 0.05 %CO2, 0.93% Ar by volume. a) How many molecules of each gas present in 1.00 L sample at 25 C and 1.00 atm. b)What is the partial pressure of each gas?
The equilibrium constant for the reaction, 2HI = H2 + I2 is 0.49. Calculate the number of moles of hydrogen produced when one mole of HI
consider the expansion of one mol of a monoatomic gas initially at 300 k and 10 atm. the expansion to a final pressure
Consider the electronic transition from n = 4 to n = 1 in a hydrogen atom, and select the correct statement below.
A 32.22 g sample of a metal that looks like aluminum is heated to 99.8 C in hot water. The metal is then quickly transferred into exactly 50.0 ml of water at 22.9 C in a calorimeter
Titration of 25 mL of the calcium hydroxide solution to the endpoint requires 12.15 mL of 0.070M HCl solution. a) What is the millimolar quantiy of OH? in the 25 mL of solution? b) What are the concentrations of Ca2+ and OH?? c) What is the solubi..
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