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Question- In the colorimetric (color producing) assay for iron used in this lab; potassium thiocyanate, KSCN, is added to produce a deep red colored precipitate. The lab outline suggests that H2O2 may be added to enhance the color. Write a balanced chemical equation showing the function of the peroxide. In your equation identify the oxidizing agent and the reducing agent
State your answer by means of three significant figures.
Draw Lewis dot structures for each of the following molecules.
At a certain temperature and pressure 4.2 L of N2 reacts with 6.3 L of O2. If all the N2 and O2 are consumed, what volume of N2O3, at the same temperature and pressure, will be produced?
If a sodium hydroxide solution were added to a solution containing lead(II) ions, sodium ions, nickel(II) ions and potassium ions, which ion(s) would remain in the supernatant?
A block of metal has a width of 3.2 rm cm, a length of 17.1 rm cm, and height of 4.5 cm. Its mass is 1.5 kg. Calculate the density of the metal.
A gas in thermodynamical equilibrium consists of a mixture of 75 % hydrogen and 25 % helium in mass. Calculate the abundances in partical fractions.
a 55.0 gram piece of ice at 0.0 c is added to a sample of water at 8.0 c. all of the ice melts and the temperature of
describe the intermolecular forces that must be overcome to convert h2se liquid into a
How would you make a buffer with a volume of 2.0 L, pH of 5.0 and a strength of 0.25 M using 5.0 M acetic acid stock solution (Ka = 1.8x10-5) and sodium acetate ( NaO2C2H3 available as a solid salt FW = 82 g/mole).
A balloon was filled to a volume of 2.50 L when the temperature was rm 30.0 C. What would the volume become if the temperature dropped to rm 11.0 0C.
Explain how many moles of nitrogen n2 are in 0.650 mol of ammonium carbonate (NH4) CO 3. Explain how many grams of this compound supply this much nitrogen
How long would it take to electrodeposit all the Cu2+ in 0.200 L of 0.250 M CuSO4 solution with an applied potential difference of 0.270 V and a current of 3.55 amperes. Enter your answer in minutes.
What mass of potassium carbonate K2CO3, must be weighed out to prepare 125.0mL of a 0.0500M solution of salt?
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