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When a student transfered HCL to a graduated cylinder for addition to the sample , several drops ran down the outside of the cylinder and on to the laboratory bench . Explan the potential danger of this situation , and suggest a good way to clean up the spill.
The percent chloride in an unknown sample may be determined in a manner similar to that used for the determination of the percent sulfate. Suppose that a 0.6123-g uknown choloride - contaning smaple was dissolved , and AgCL precipated by adding AgNO3 solution. The precipitate was filtered , ignitied , and found to weight 0.3324 g. What was the percent chloride in the unknown.
A student , following the insstructions for this experiment , precipated and disgested BaSO4. After allowing the precipitate to settle, she added a few drops of BaCl2 solution , and the previously clear solution became cloudy. Explan what happened?
Explain why AgNO3 solution is used to test the rinse water after the BaSO4 precipate has been transferred to the filter paper.
Determine the pH of the solution before the addition of any HNO3. The Kb of NH3 is 1.8 × 10-5. a. 4.74 b.9.26 c.11.13 d. 13.00 e.12.55
Identify the orbitals to which a 4d electron may make an emission transition in the hydrogen atom and determine the dissociation energy of the molecule
A pound of coffee beans yields 30 cups of coffee (4 cups = 1 q). How many milliliters of coffee can be obtained from 1 g of coffee beans.
Find the molar mass of the compound. The reezing point of benzene is 5.49 degree celcius.
A gas has a volume of 95 ml at a pressure of 930 torr. what volume will the gas occupy if the pressure is increased to 970 torr?
the Ka of hydrazoic acid (HN3) is 1.9*10^-5 at 25 degrees C. what is the pH of a .35M aqueous solution of HN3?
The density of citronellal, a mosquito repellant, is 1.45 g · L-1 at 365C and 50.0 kPa. What is the molar mass of citronellal?
What is the balanced equation for copper (II) hydroxide + acetic acid (HC2H3O2)? and what is it's reaction, single, or double replacement.
A 4.05 g sample of a compound containing only C, H, and O was burned completely. The only combustion products were 10.942 g CO2 and 4.476 g H2O. What is the empirical formula of the compound.
How many liters of ammonia gas can be formed from the reaction of 150 L of hydrogen gas? Assume that there is complete reaction of hydrogen gas with nitrogen gas and that all measurements are made at the same temperature and pressure.
Sulfur in the air reacting with silver flatware to produce tarnish, or silver sulfide. What is the limiting and excess reagents?
Calculate the mass in grams of carbon dioxide that will be produced when 25.0 g of ethanol is burned.
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